Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e693239a481726…

MALICIOUS

PDF

91.9 KB Created: 2021-08-19 21:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 125766b459052adf2e4a8de9f41a113b SHA-1: 7f58370299da4ebc1066ace3f99ed3836b9e5fcf SHA-256: b6e693239a4817263406f4db63e6bf3ccb0045675329a3537e24f09fa9a5d5e0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or malware delivery, aligning with the characteristics of a spearphishing attachment.

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://oniceh.ru/uplcv?utm_term=cooking+bacon+in+farberware+air+fryer PDF link annotation
    • https://nabijdefossa.nl/upload/files/forazowu.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607049b007966---medolu.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/a374b9a4bfd4a9dc3d11c937c3c8e2e3/xobexipafogox.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/fonesowala.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160de8c66e48c5---84619171791.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/xobokubosemufup.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/49185962611.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/lekifisenadate.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/jobenokoxutafuz.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/d49c5ee750ac1cea0d6a4431b0adcf01/wadinevebe.pdfIn PDF document text
    • http://balone.net/_upload/file///14595959918.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/10935406226.pdfIn PDF document text
    • http://18554080.com/userfiles/file/1360270746.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///juzafa.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/t9keeigechclphietppd1fkaat/79753539956.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f90e77f9---burepifu.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/010322065625.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/pokahpkcj90nlq6ql76epkgpqu/9999942385.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/82738537683.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607f260bc051a---59201128830.pdfIn PDF document text
    • http://iphysiology.ru/upload/nizotefuxidasiwu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609660232fb2a---seveberewuled.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8238815750---delamitekamibilefeji.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/35033694278.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/e24a25698ce68f5db89df791e01208cc/fegewubodasexibajumafak.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_off0001053d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053D 10664 bytes
SHA-256: cbbacde5bdf188fef7792e33444b6e7b0aeca8baeb9124eeec5d7387c4fb398f
font_01_sfnt_off00011dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEC 16816 bytes
SHA-256: 6ca769e18c26354be2ca5e5f9faa56b132e4d814cbf7d5bc786dbd762eb3d05a
font_02_sfnt_off00014961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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