Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfefe57fb60d7c8…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 19:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3431273a82a1e60ce0bcc0c9670036d0 SHA-1: 55bf307b40014632c14fbf69823eaebe395f51be SHA-256: 7bfefe57fb60d7c8bd41bdc6251f14c7acb3cf190ae70f1af6f742d930ad1d37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, hosting numerous URLs on potentially compromised or disposable domains. These links likely lead to further malicious content or phishing pages, aiming to trick users into revealing sensitive information or downloading additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://4u70t3k0-4tl.com/contents/files/juvopora.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/96cf2744ed744203b6289125073aa4b7/20539846662.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/xanigitegesiriguk.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/matoxejep.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/82414205547.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/49778532130.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/79742290644.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bawavabuwapem.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/gchgu09e71vmiv275921umc1in/gogapido.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/94046928505.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/fofefunefafufipugezup.pdfIn PDF document text
    • http://erictex.com/ufiles/files/58018443678.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/63058036179.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/gonepuziwixele.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/tosetafowejatilobifison.pdfIn PDF document text
    • https://brs.jo/userfiles/files/wuligikixodonivop.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/40427015653.pdfIn PDF document text
    • https://nistd.in/userfiles/file/vofeveleta.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/f8ra58bls01hrh3raak4tt35qi/jebalititone.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/pevowuboxomapulabexozata.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/57510411211.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/91205835631.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/kagapedimibo.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gobemedaguvosazexeluvofeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=read+nfc+tag+android+codePDF 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_off0000b59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59E 10484 bytes
SHA-256: b3fe39b30116b8bcd73906e9589461fe26f7b6e45aac5190a54d6712e5f1dfc7
font_01_sfnt_off0000cd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD51 17408 bytes
SHA-256: b96e10e9c5a6342cc2b36ba781a592a97a8f9a2d9b6bcc3b99ee83680aee9357
font_02_sfnt_off0000f9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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