Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e334815adf4ceb3…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 23:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ff133f6cdafed60f3bd18ac27a46efa SHA-1: 1a7815bd6cdb6b2c493a79e0b429cab623e6b596 SHA-256: 5e334815adf4ceb3ff8be5f8e4954e82582a773f41ac1d9c714f13bf761a97ff
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/dae41a81f2c6847bf355eb5f476512f8/gufakonimorijulegizazujiz.pdf In PDF document text
    • http://cecev.com/stockages/files/21186303368.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a414ecb12a0---46397405971.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/suwekigaxaravumoroliv.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/sekanoge.pdfIn PDF document text
    • https://incense888.com/uploads//files/202108021104339067.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/20589948968.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/5cb2b54ff9b94c682e387c0d9b2a1b68/xumikesuf.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/silukutofivanunidekipawes.pdfIn PDF document text
    • https://harryfok.com/ckfinder/userfiles/files/lejipibuzilifo.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/kipegutaxurababasofe.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/332lgiba5hg2cvp19fl5fcop74/52440804298.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/46068563431.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-29/20210429104629197208.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/danofixofirate.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/88114845659.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a3f3f71da24ee139c01feaed7e31d9fa/93476787296.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/bipovosef.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/98678939448.pdfIn PDF document text
    • http://ashioke.com/images/library/File/purevezupilofidu.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/5ueldi6pdtk2penc6qhalobn99/66321907980.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/96580895038.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608a55e2468d0---kefif.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/2c3f64157e1729fe22404d96a1396592/43185669167.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/potuporozome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=verpackungsgesetz+pdf+downloadPDF 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_off0000d697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAE 11012 bytes
SHA-256: cb74cf4f9333fde8b2ba8d80069812aec64636b83ea695b9f87c4b0cb481d204
font_02_sfnt_off0001085a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085A 17244 bytes
SHA-256: f94736fe950b288ab087385ed30819fcd824e595c80e6fc3d5fe60b8af318980

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