Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f5ccfa27744dbb…

MALICIOUS

PDF

83.6 KB Created: 2021-09-20 14:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9807b10816151e8e53e15cdc5d04abbe SHA-1: a59977c990869154169c6c7d290c50f682391d15 SHA-256: d2f5ccfa27744dbbb4958efdacf8238f4b72f32e9fcb34bf5ef543926f012271
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the interpretation of this file as a malicious link aggregator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=win+7+pro+oa+iso PDF link annotation
    • http://chengzechem.com/upload/files/41340211291.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/sugelarul.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/40537139175.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a1a63ff94---zizufugaladidezi.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/39006042484.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/71084560712.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/tutepavunusojobokefoliwiz.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/ripep.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/tazebuzelak.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/luledamudizedivunapawe.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lorilizesak.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9fceecee3---mukonelatajixatatavagiti.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161403104a7422---43324279040.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/nididajuwepijugu.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/32187455494.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/44921890995.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145911492678---fagufonofutu.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/nomige.pdfIn PDF document text
    • http://marquisdecor.com/userfiles/file/jokedadoxixalotanogupus.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/98591562559.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/lanotiwuje.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/55363510870.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16130d50e6e92e---kitegufuto.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_off0000e337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE337 18136 bytes
SHA-256: dea7bc1dc03b03a6076855a135a88f2fbf088cf883e662e7a8edfb1deb7dc52d
font_01_sfnt_off00011277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11277 10012 bytes
SHA-256: 199e2dcbdc164e195b2637962af6d88f92faad16e169392bdd67f0bba5a8369d
font_02_sfnt_off000128d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1