Malicious PDF — malware analysis report

Static analysis result for SHA-256 603b763824988abc…

MALICIOUS

PDF

79.6 KB Created: 2021-09-03 09:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e6dc7c74fc698cec2528033827d7ee8 SHA-1: 82cb6dac8b350b57cbff9d89054ca16736a088a4 SHA-256: 603b763824988abcb66d27da09581411a2eb7e5f61cea94c44bb7aaadaa4c3fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the link farm behavior is a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://ukwoodrecycling.com/userfiles/files/96904795227.pdf In PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/36190637331.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/kadopafarez.pdfIn PDF document text
    • http://standdominica.org/files/files/bukisozebojuxovevufalulim.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/95683928412.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/76627082637.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/dasaxemonogi.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/xopoj.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/88390237621.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/df7f1a7ea1e83886c5e231584595a99e/93021469108.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/raperufadativike.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8c4a3cb14---52925994994.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160774ef3a23eb---76220837401.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/libikesuletoverimuxu.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098609f70960---21164962941.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/be8096193fe2202e0cdaa2a04001ba68/tuzujituredexoku.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/85247526314.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6ab515584---33769076136.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1c3a9820b---letifurenibuferebekel.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/874c5be00e9f6f88c7d1ccea960b5b82/63615298880.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c53f53e07---41482549419.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751e08968ac---juxaluvozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=shopping+in+spanish+worksheetsPDF 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_off0000d02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02E 10740 bytes
SHA-256: 40b61da9afae4c40a5aa4bd28bf56ab11682698392c53383dded545c642090d8
font_01_sfnt_off0000e8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10104 18364 bytes
SHA-256: 363ec97ae1a9122a57ec2b15e07ff7bb446ca40be300678dd428a5c0082808e6

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