Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf0b2bd937f8740…

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 14:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 91291756072a32a0c14a703685570a59 SHA-1: 9b4dbb13d5f006fa5932afe45c14af21448d8f0a SHA-256: ccf0b2bd937f87409195cc002624b8676b9fa8bd87d62fb5f675b49ddacc6133
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, despite some being marked benign, are part of a larger pattern of redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://onfireinteriors.com/userfiles/xuvewekifaponekunuj.pdf In PDF document text
    • https://smithsgame.com/calisma2/files/uploads/vepotofenanuvazebo.pdfIn PDF document text
    • http://stylekd.ru/files/45218800479.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/9tb6ng1vj33ldrvb1hgt9j7fd7/rofelejone.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/lobanolewa.pdfIn PDF document text
    • http://expresskaliski.info/file/wiwiponowafagejadunu.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/jizududigowonidod.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/guvarug.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/91325954563.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/b1f759b337b42fee72c76f88e5d0f890/40699123065.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/wexumo.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/wigiwuxotagofoforaxof.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/pekujojatufas.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/kofegan.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16084049718161---88256194559.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/wubidedasa.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/2519713902.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c35f7da3f5b---33880002332.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/redevofelin.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/3fjgkeakoidsuh36uvu6aaf0o2/18099749127.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6356c4ef86---52358878856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=gseb+std+9+maths+textbook+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78D 11200 bytes
SHA-256: 78d477496e8a5cc24a744fa75a6ea4c413bbda599f4710e3e9a2797440420bc2
font_01_sfnt_off0000e187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137
font_03_sfnt_off00010f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0B 19620 bytes
SHA-256: ccdfa897d7441a4e47c4548b45088e4b77bc6c64868ab0b68ced764777d91d36

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