Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f82e106392beca…

MALICIOUS

PDF

75.3 KB Created: 2021-09-02 08:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d0cf36a1a0411c4f8cbddd623595b44d SHA-1: 79b0f4e0201a7a5f0c5255daa4e29b2e7210153b SHA-256: 37f82e106392beca95e90e8437f785d04aebfa2923a6a6f5afb0875bcde5c8c2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including ML classification and ClamAV detection as a phishing trojan. The document body, though heavily obfuscated, suggests a callback phishing lure, prompting users to call a number for support or billing issues. The embedded URLs point to compromised websites and link farms, likely serving as part of the attack infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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 https://inwebjor.ru/uplcv?utm_term=it+band+syndrome+hip PDF link annotation
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdde512979---25892638455.pdfIn PDF document text
    • http://mlight.cz/archiv/file/kegowipitogifef.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/79100876520.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81828280397.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/btl3dvtjm5k2m1esojfi2rma56/pefijod.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/7cd2513bcce9675e5853ad4747e2e914/93571390914.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/67310188248.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/5439174f58faeeaf95e6bb6cd51c9895/55954470935.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/35075194661.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608af6d108d2a---99675369839.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e95bf614a9d---47802439869.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/eec293165a2e0d6cc73b0e44e48edb5e/rujawenaj.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161233ffac5f98---88502400376.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a813b65b3---lozutim.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/3f95d3b4264bc2559b45381b7fdc8d17/80095397167.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/popewugufojipexigafusok.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/dujinizo.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/wewexakikilo.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/2596784166.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/wajexaliwirogevogax.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/4eef0c557c553a9d682bf0e1cd0d8f3b/16638803979.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///9626482481.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/2841c2a715e4b24b674e661fe988e4fa/bajuwofepoguwumid.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/metobukezi.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/cbfceb5d8efdf05e1bed88452acabebd/17175081848.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_off0000c47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 10816 bytes
SHA-256: e99e8165c926ece6800a19a067ede64380e609d707ca21d88e060b024ffbc11b
font_02_sfnt_off0000f523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF523 16552 bytes
SHA-256: 526e8824d3c1838408975b55bc883ed4c9c4b450f1564ea2d2b238c4d86a2d1f

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