Malicious PDF — malware analysis report

Static analysis result for SHA-256 819b11605beb678c…

MALICIOUS

PDF

87.1 KB Created: 2021-07-07 03:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ccc1153328edd9561e445a90bb6a8f5d SHA-1: 2c20035a1fe19affb0a4c3a2a0065a3a1e237c88 SHA-256: 819b11605beb678c95e4228ff5cb42a37362fd6ef1f77f2dbb2de2b751534723
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable domains, indicative of a link farm used for phishing or malware delivery. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. While no scripts were explicitly extracted, the structure and URL patterns strongly suggest an attempt to lure users to malicious content.

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 https://coretry.ru/uplcv?utm_term=uncommon+boy+names+that+start+with+j PDF link annotation
    • http://dermaktif.com/imgup/file/85833261588.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/kogos.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/v9ul9ll3rbmk3onbanfsesrvdc/viginumoforibikoferifu.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/gidozelasakobasefofob.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/qel4arbdl9dol2jnu2089bt3so/32269910949.pdfIn PDF document text
    • https://ka-base.no/images_content/file/zewudewevosifam.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ccdfd72c19d951584efa067c584654b8/kukisegunewabeg.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/25963814396.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/93110af985ba86c41ceca4ddbf933a5a/zawimojunatugawoti.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9596f918ca38d1d7218079dca7a97999/44897512688.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/sazewimitozusakodaba.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/f156ca0d7f14211606c5d8eb35f14531/fimexoxixusuke.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/41578910249.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de5ff46d2f---karifevodov.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/91198d195f2105e384543b9fbd1a9f29/37850489423.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82a8153c61---bivezipafejaxijeka.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/29402688244.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/2880c9f9bbe863cc0c936702d9d0e83e/dilovasojagane.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/9ddd8439f455b813afb0da8cc4da59b7/fixokosagufuzed.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/65929096652.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/9e6c82cff893278e331aceed0267008c/76519115787.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d7765876c---virapa.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/83874c202be3bc729da441b72d62b5c9/gidalisamudexiza.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_off0000f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 16804 bytes
SHA-256: b2c452878d384bddd7cbfbb80a585ea69885374564e20db4b96a7ecbdd5da54b
font_01_sfnt_off00011e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001361e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361E 10928 bytes
SHA-256: 608b319ef56ac2f7d616bfef0d438b9655eb3b38e72a289e9fecdccd5439d291

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