Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b931d0a0f4c73bd…

MALICIOUS

PDF

89.4 KB Created: 2021-09-04 09:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 66d6aad1fac789f2f0db855a2748b16d SHA-1: bf0d38ae2993da6c732dadce76af0fb3f0c938d5 SHA-256: 4b931d0a0f4c73bd9d3f64dffdc33b2395b95005f4b2d5b5f019796316256004
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://umutisi.com/umut/upload/files/teluxiguwoxutalaragitas.pdf In PDF document text
    • http://phannhan.vn/files/usersfiles/files/nexixenotip.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/95889782d60ec6e50306350a6d467a8b/zawukabatalefixotu.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/58391058271.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/64450373956.pdfIn PDF document text
    • https://dvg.asia/ckfinder/uploadfiles/files/ligamodufedigije.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c87ff651306---75279476544.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a0fc0d7233d6ca3b4ca61e22c40c7bfe/lujobunovosagigo.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/barbvulcjan7vdti939nafhgk6/7836684642.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cf951bac8a07f9ad95ed5416fb706dfc/vemidupisuxosig.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/72260673288.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/viwofonu.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/pejapizitukixak.pdfIn PDF document text
    • https://goldenapp.net/file/sunazisej.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/421d96b96f6aadde5f9de5b46db03866/sujogixupogabefiko.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/52939e7a69b1972064c5583ecb60b4ae/bugozinalanal.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/95194623943.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a492ab2307f---52720299877.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/zanakaw.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/6128772076.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/83176179291.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/89200778189.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/xafitufot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pdf+ebook+archivePDF 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_off0000fa34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 10456 bytes
SHA-256: 79f717b4bad17f3bddeaf198b58d2e31e5afae6eeb094673850279dcabbba0b9
font_01_sfnt_off00011212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11212 17544 bytes
SHA-256: 9bbb3fe4f785951a2aa17287cc603358dea5f5a6dbff3386aa9237db537afe03
font_02_sfnt_off0001403b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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