Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b26f33da90dc5a1…

MALICIOUS

PDF

117.9 KB Created: 2021-09-06 04:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10736138d945269be93168e7d4e7ee9a SHA-1: b1ac98e34ba217826cb9d702df7c3ded59d14bbe SHA-256: 3b26f33da90dc5a110ee0a18e5d2acbcc5b809c43b2da372961c6abce56935df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of a 'download' button lure further supports this phishing or malware distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 https://oniceh.ru/uplcv?utm_term=download+novel+game+of+thrones+bahasa+indonesia+pdf PDF link annotation
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d77a3421b---48007750469.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/sezifumisowapo.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/51677370691.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16073b9a62aa69---4428845164.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/33693896ec643a36349376f37762e8d8/rojene.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/93365644783.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f766125bb83---jetaxari.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/b2afc2a9fe63500e6dadeb7f5c81f096/durotemesakud.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92a2992cc5---benimoxim.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee371d75c9f---87582023668.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/wafirugef.pdfIn PDF document text
    • http://bluedevils59.com/clients/862365/File/mawogunamolawolufisaw.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/98947949942.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/58488289448.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160dfc8882ffeb---jamepewinexugew.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/65930376840.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/62798cc10e3e44388e0456b063c9aa86/13123109860.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/kexevutavegikikadu.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/8994263995.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/lasodamibamufosunato.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/95371060067.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071e391c02a8---fawojumelejakakov.pdfIn PDF document text
    • 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_off000159af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159AF 23844 bytes
SHA-256: 1b3aee3467dd5680d369c7b8a22696fa8be0cb624083cfa530dc2fa18a75498d
font_01_sfnt_off00019869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19869 11236 bytes
SHA-256: 9f87fa5881ead17dc5047fb45cd9a69527f99423939c429aa79a0c0760421992
font_02_sfnt_off0001b222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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