Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f7d07d8d3b5369b…

MALICIOUS

PDF

77.9 KB Created: 2021-09-08 15:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3c956d46f08c450493cd2ceaae351561 SHA-1: 05c800936723ee739225b8dae527b0546241e4c4 SHA-256: 1f7d07d8d3b5369baf7ba53bef9b8f92347c5e8f3786c56642f52c7a2f82b7ee
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are indicative of techniques used to exploit user trust and deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://bielle-srl.com/userfiles/files/lolasorutogixanekapa.pdf In PDF document text
    • http://temple.mo/userfiles/file/gosevakovefi.pdfIn PDF document text
    • https://akemi.ro/hirek/file/puxugurulotime.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/27632109779.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131564843af1---69880739173.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///60663054127.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/40828244599.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/divogebodaxegewopokiz.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613620502e0ad---zutejewuzajiduzekavuku.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/zogobapoj.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210906032722.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/89929357760.pdfIn PDF document text
    • https://diphong.com/uploads/mawususamifipamoradelo.pdfIn PDF document text
    • http://inphilong.com/upload/files/sutopavobugiwamazen.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/bipuporuwomoxakaxokul.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/44010800513.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/lewuwodugituxifas.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/kajuxuxajani.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613443a7db194---44605816813.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecb4793ce5---xakazilegasex.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/guxegepiwijujirapas.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/17544918449.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/litijedezuwowesofama.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/84117636563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=submersible+pump+construction+and+working+pdfPDF 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_off0000c781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF98 11456 bytes
SHA-256: 1cb22f740aa9fe55221b55b3e7d6828e3f041f65385c91e00bea4fcf877c4ac9
font_02_sfnt_off0000fa46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA46 18384 bytes
SHA-256: 2c1af76e4335bcca75fd22e23ba951b30b40fcbc9984c4cd7fd8157594c9d84c

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