Malicious PDF — malware analysis report

Static analysis result for SHA-256 c027837d701446e4…

MALICIOUS

PDF

87.9 KB Created: 2021-07-18 19:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aad343c798b0e3590cc42932cfb42a24 SHA-1: 811a6c903f0e2dd3b8908ead8797dcb827b926b4 SHA-256: c027837d701446e42a63cf4fd9cda0db2fdedb33beaeb8e777253899d4f51261
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to potentially compromised websites, including WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the link farm heuristic indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/dusudosovafelevudep.pdf In PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2826b32980---22975957279.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9692ec74819ebb5671313d1a9d570a1a/35485881398.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeaaaa944c---1522699372.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/32529de5944c66c530bc22d2ca13a2e6/fazerenofodifobirixasaxiz.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/nimenoserobejibipero.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/76561520137.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ee7225734---55381961554.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/snj3qeuckl1n8vijrtbvhn5dqa/29279406484.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27741e5634---56268865061.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085d9128a1bb---61073298159.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e8b14b6a4---suseravekuwa.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/luwoseluwo.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/28702007313.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abbbd1ea52---liwafukoz.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/da4f3aeddc396756d733c0c297c997eb/malag.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/tawemilavaxi.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160799593d315c---95290466182.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/f14e9dbb988ce329a9ddf834762e59fb/50048590999.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/ab4f616484a9c59d6593f8a1ced3b646/xotoredugidezaketokuv.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa6f01b308---35538078855.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/384bd85fe6b20dc787735ebd5abf8476/kuwikexopupebivi.pdfIn PDF document text
    • http://dentherapia.hu/files/file/dugijataxabikasokesewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=shallots+when+to+harvestPDF 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_off0000f495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF495 10340 bytes
SHA-256: 1f229b49d164a35977ec8ee9d40878ad22f29bf6b4c19fee887e4ded16d3c8aa
font_01_sfnt_off00010bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF3 17632 bytes
SHA-256: fea7c5052f50de9d77625eb772f3617545a81b29b2dfd9163aefbcb79dd60a1d
font_02_sfnt_off00013a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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