Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ee60b3fca97534…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 01:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d7c0faf5ec6a1aafa814332608398bc3 SHA-1: 46fc4b16cc85c53f60abe2f9eaafafba0528b761 SHA-256: a2ee60b3fca97534aebf41ebab0d6ab4d17881299cc135f944d945dfcdb43405
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=what+can+you+make+with+eggs+in+minecraft PDF link annotation
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/famodelogi.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/79621637180.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/99949189601.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/85775456533.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/xejifiditalubonisuv.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/63385235324.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/zimakaxinola.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/13031801175.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f01167e695---68224379770.pdfIn PDF document text
    • http://hun777.hu/_user/file/3092065529.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/51801009086.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/64029393502.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1614382bc8cc9e---7104616893.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/29341950039.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021092419570073499.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/38575921066.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/36324359099.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/98220253911.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/72489581324.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/79583863685.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/tikupigemuwi.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/jafusidupuwonal.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136815febd59---batekepumelanevan.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/fefb2d9581ae558898d03fecee280e62/23985935764.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/libovedemef.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_off0000b1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CB 11124 bytes
SHA-256: f46ff6316a447b9d4963bcd8eb200c1158af8b8f73a38978e64505701fdde45b
font_02_sfnt_off0000e3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AD 16332 bytes
SHA-256: c59f3360eb371e9071d74695758c6618517801ba67243ca195b586be382fa347

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