Malicious PDF — malware analysis report

Static analysis result for SHA-256 08dac951a3d5f70d…

MALICIOUS

PDF

77.3 KB Created: 2021-09-15 09:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fc12b02e6c0716d22aba7eb8045aa95c SHA-1: ef5b5f1c0c71346b7b6f0181e3d2075551c5b36e SHA-256: 08dac951a3d5f70dbe8a37eaf0c27558e36bd0593c2077b1e7cae14de40e2c0f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number in a deceptive context. While no scripts were extracted, the presence of numerous URLs hosted on compromised or disposable domains suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://yeongwonenc.com/userfiles/file/pelepodatusot.pdf In PDF document text
    • http://shopabrang.com/images/files/82701302672.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/jofixad.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/6097618060.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/de0cd74be8207cf7efee5228d8a5fa9d/lemowogifile.pdfIn PDF document text
    • http://ahknchem.com/upload/files/66922367770.pdfIn PDF document text
    • https://novsport.com/content/File/10110849323.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/biguwekapajodanizej.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/dudijetubinusabapujewov.pdfIn PDF document text
    • http://princeverma.in/uploads/files/86521711283.pdfIn PDF document text
    • https://stotex.rs/files/bibekufawupefop.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/mumezekoluvemumobogagi.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161410d4bee159---48338184454.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/93810783.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134522d132a0---99698198048.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/51206174366.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/gilexavagifesudizibexo.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614180be0b83c---danijem.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/xudagov.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/selimilalogu.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/zuzewuletunogi.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/79908512394.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/66155589014.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/dizepeb.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/kanizelavewodunawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=fire+tv+stick+install+apkPDF 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_off0000caef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEF 10380 bytes
SHA-256: bfb9e97e2f1685313f26f16d7774dbdf21970483194ab12c9cdc4eee648c13db
font_01_sfnt_off0000e291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE291 17372 bytes
SHA-256: 03e4077e923950f24c6da4f0e3ed43433ac2dbe25153c4004398a1c12ccf4e73
font_02_sfnt_off00010f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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