Malicious PDF — malware analysis report

Static analysis result for SHA-256 580916ebe1e22789…

MALICIOUS

PDF

88.0 KB Created: 2021-06-30 05:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 55b49253ac96b9bf2d2553e6097a289a SHA-1: 3f1854d831c3c37760add1a1f61d7bff96891661 SHA-256: 580916ebe1e22789779562e01efa42a6d921b065e9b661521f19ad42988304af
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers flagged it as malicious. Heuristics indicate a brand-impersonation credential phishing lure, specifically impersonating Apple. The document contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing workflow where users are directed to malicious content hosted on these sites. No scripts were extracted, but the PDF structure and URL findings strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=nclex+review+questions+with+rationale+pdf.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8ca5ae248---2974025208.pdf In PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a208ffed910396911e9038c5a7759ae9/fadijomowo.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3e1785cc9---sirupo.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/85538048055.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/22537243943.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/59609419449.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608748bd72fb3---pazojemazeruzefe.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074057eaac87---legowefumebam.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/650ca358004acf6375c33752a0c7cdbd/somazarur.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160983207c87ba---zipudarufudexufako.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/27673941712.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160cec049d3d8a---pezuwarukopanamanuwipasu.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/jemedutojil.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c18d4b475---48549308535.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/92657057847.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/66923030582.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/vedadererazufowutomakibi.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/77a8f43b30b7ffeb03cb89b540ddc351/50638817615.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/nunozawuvujizede.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ee11547c4---goramubememixiradakalago.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/45904579671.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/47553684293.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/561466768.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd0704bafa---92606926975.pdfIn PDF document text
    • https://digireg.lu/upload/bojukolubidinodapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=nclex+review+questions+with+rationale+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF083 18060 bytes
SHA-256: 78eb00f04331a887bf91758fe2b7d1dafecb954899ef8e0f06e7ab72134be717
font_01_sfnt_off00012069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13880 11196 bytes
SHA-256: a6b9185c460e78a55025faa1a757b20fc986c911f1f8826769ac31d4b47882c9