Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc263353e7a4ca2e…

MALICIOUS

PDF

88.9 KB Created: 2021-07-15 14:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40fbf93b4b70c04532a6124e84442899 SHA-1: 960c7aef5bfac15d7d9fe1167329416419ff7903 SHA-256: fc263353e7a4ca2e3c3a9521bf8604f0a255f808849bd52f3ea8f8e11ba37ce6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm pointing to compromised WordPress uploads and other disposable hosting. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's intent is to trick the user into calling a phone number, a common tactic in callback phishing scams. Although no scripts were extracted, the presence of numerous URLs and the callback lure heuristic support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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=watch+the+quest+1996+online+free
    • https://lescourailleurs.com/upload/editor/file/zaxuzuke.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/54fccead17d64dac46ae6b6462d948a2/sazozibejurutubalebu.pdf
    • http://jyotiacademicpress.org/uploads/file/difikezasiwi.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cad50ebe828---1599360181.pdf
    • https://medicentrumnz.eu/medicentrum/files/file/16617870654.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b115a4a60---nozobutetoruwejukox.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4291dc479058f438e85007a3cbc0decb/ligabaturavurofuxarunite.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92e3b77a88---82133144333.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea68e8e1e0---taselajewujadevebibibe.pdf
    • http://krakow4you.pl/krakow/files/34848319678.pdf
    • http://apsencollege.org/test/fckeditor/file/sedefewibedev.pdf
    • http://agataklimowska.pl/userfiles/file/85167959964.pdf
    • https://creteotels.gr/FCKeditor/userimages/file/jepunuluwegibubem.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/356cffad0728f1312875b2e9958b8a6d/47661995309.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/gg44boohlcshj3k12r955ecop5/26601608934.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875944930cb---porimi.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/lvk7rfmu8ojmtvgcegf6qm1pc7/lujekitowovajawaka.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd783e3c3d---kipaga.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd426db1f3---19639319035.pdf
    • http://sharon-barron.com/userfiles/files/jotobapukafewawevigesuziw.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d8153db6b---lekovesavatonijixodizu.pdf
    • http://tomaszskiba.com/userfiles/file/gezividafifaf.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/4d84384932c7aa9a43e82a33c18fdb49/75520837190.pdf
    • http://assushop.com/userfiles/assushop.com/file/16302818024.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/7ad0a355b5bdc4d0aa9347477998d727/34561238117.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/duhlp9dg9d4q84p8fh10uotfbu/rupurixuxiralezirev.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 16792 bytes
font_01_sfnt_off00010bde.bin
a1c2dd9c6433b6e95c7d51eec16ea37e275a02cd29c3186a134757aeee2b0150		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDE 11060 bytes
font_02_sfnt_off00012597.bin
cef80396a966895ad75e1f7995a76ab40787aba7678011a7a46efe9afb01c1d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12597 17996 bytes

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