Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8f0d3fa5ac9ba1…

MALICIOUS

PDF

83.4 KB Created: 2021-08-31 02:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ec068b0d0f61e6af2c9e2e8ddd616599 SHA-1: f9c866d8f24d1a66b9b320d62745b0ecab144f99 SHA-256: da8f0d3fa5ac9ba13c213fafcefa73b96dfe5f75ff45b4538f90a419af69bce7
156 Risk Score

Malware Insights

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

The PDF contains a large number of links 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 for SEO spam or phishing. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings confirm the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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 http://aan.kz/ckfinder/userfiles/files/lupetaxatugozokus.pdf In PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/8j3m5hlp513doimmnl59i78jmf/20124457201.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/48317062983.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/mugowegonaditigipivako.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/913db43d8779299d762fe7620ce4e4bb/xabelenebazegizomoriwi.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/woxexot.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/85281023363.pdfIn PDF document text
    • http://tano-cable.com/d/files/63288006720.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/702bdb49f409e2a7d3ba4bee5217c7a7/39291961802.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/1b030e264a29e42d26df44d50e69322c/dutolojaborofosafoxig.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/d3db20e64beac5ad10e990483d7d7c95/96938015896.pdfIn PDF document text
    • https://basisangka.com/contents//files/57550615905.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/megegutukerigezevixix.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/25361848069.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/pozegovewivalowabisofesa.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/moxijipizikejamebaxes.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/54360918693.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/4ed84b295405b93694043e895a7a6e43/49374227524.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/1ca997352760acb382b1f1c3844de23f/27234870776.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/72585933140.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f5446cd6f---71623683887.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/191gpbpj0qsc292qfrbhhnbk62/38510773612.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1611d8d56dfdfe---157479282.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a575ca1e0---48402261708.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8b0a80ac4---91423961809.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/doxono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=rahu+in+5th+house+from+lagnaPDF 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_off0000e01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF832 10940 bytes
SHA-256: 11af96d3567ee8b7fac55c3c2bf1e9630e035557a19ed5a3a1540edd4291b876
font_02_sfnt_off0001116c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116C 17736 bytes
SHA-256: 832031ed7ee270e062efdc15343885747aab7627c4cc85904f44c8a082d3031b

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