Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f77f292b14311be…

MALICIOUS

PDF

86.9 KB Created: 2021-09-14 13:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bafce0775e07cf915c66b0ec60b7da81 SHA-1: daa19060aee81faaadd9268d0339b78a7962e992 SHA-256: 0f77f292b14311be2892cc71d8f7aeebd4e8d00689d839d2f5a8ea886f57e9b8
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://total-sport.pl/img/upload/files/51116760224.pdf In PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/68135548935.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/33791865856.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133eb9fcbe0f---buvoxujajofupizewubiz.pdfIn PDF document text
    • http://signauction.net/userfiles/file/miwor.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/zevip.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///varifudosa.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/f293db5e34f466a5eb4d600d27de783a/lopoval.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/vawifataguxugovotowum.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/zikudixileladazoxora.pdfIn PDF document text
    • http://www.moyekolodin.com/files/64622461097.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/27373962412.pdfIn PDF document text
    • https://digireg.se/upload/3826247147.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/4461249282.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc90ea896d---54758166095.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc355950ea---pelemivajidojovipu.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/4962929270.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/pezoguwidolodavop.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-14/20210914151739843175.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e6eabfb1bb2f9879e0f278e5a4af9c4f/92608757615.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/84046056307.pdfIn PDF document text
    • http://poorclarescork.ie/images/97157913122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=dante%27s+inferno+english+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_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 17912 bytes
SHA-256: 864a3e28b5a55ccf5759cc1974ae9db099b5faa1aedead19844c04fde86f8cdf
font_01_sfnt_off00011cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDB 10812 bytes
SHA-256: 25d3a5a084468351f869d78c7f52e002402d89a3289b896dafefe672ba94a326
font_02_sfnt_off0001358c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1