Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16f2b2d0ea1e8e6…

MALICIOUS

PDF

71.5 KB Created: 2021-09-19 11:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5aea547e8a0cbaac6ef7c389e7c2f5b2 SHA-1: bfe983f362438e079be77d8fbb0564fed62dd63d SHA-256: a16f2b2d0ea1e8e61c4e72bb6058ab240bec21c205170b977e1725734055c64e
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 compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URLs point towards a common tactic of using documents as bait to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=veryfitpro+android+4.4 PDF link annotation
    • http://thepokeluau.com/uploads/files/nubezotininu.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/73819398548.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/titozevuzilo.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/87811871991.pdfIn PDF document text
    • https://badoza.net/userfiles/file/52779658592.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/jinubuturiwunin.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109172124567351.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/83411089220.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/91078509064.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/64066604659.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/somanodujogivedilovasax.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/tunefalenetewolu.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/nabatokavijikekafikipugop.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137d3947274a---nejavisok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0719d4400---vusaki.pdfIn PDF document text
    • http://immopolignano.lu/images/wufopilerotexapeb.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/65886791713.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/3977696477.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313eef3f52e---kuguvapenetegagijavomupaw.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/014d2642a0af1b37ca425441a00a77db/11325954872.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/pofaz.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/paxapuvegojowanetedis.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/46410064985.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/fazifixu.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_off0000b6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AE 16392 bytes
SHA-256: 24b526b4e8996bcdaeafba4613c1e8eb7f456997239f26e432abd91d8b79f80d
font_01_sfnt_off0000e01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01B 10504 bytes
SHA-256: ba6f6766a1f15b790a2e61c357ad69199c0a1525e09ea0b62950ea7dfe36ad4c
font_02_sfnt_off0000f824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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