Malicious PDF — malware analysis report

Static analysis result for SHA-256 4daf213f531e3075…

MALICIOUS

PDF

83.5 KB Created: 2021-09-12 17:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a9df12e9156c5f4adba4188eb1aea8ec SHA-1: c74322d269da09a08a876d5bdd36da5228382a05 SHA-256: 4daf213f531e307563707d65b1c29d4fc0eee1d41f0e0ffd2b446700e8f520fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs that point to compromised websites and link farms, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the conclusion that this document is designed to lure users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://catamma.ru/uplcv?utm_term=android+1+com+cafe+racer PDF link annotation
    • http://a2hgghk.handylover.com/upload/files/tufokol.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/36042523566.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/28721189399.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/99623102370.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/6844564353.pdfIn PDF document text
    • http://compsult.net/userfiles/file/13370418400.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/163088685265392170330.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/widowatebokabibisopogis.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/26431747183.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/07vqe57mu7ti6je84vn5gf5o17/muzateduloxer.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/muloxi.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/e1qo0ek6gmn7febcjo4adhm5l0/71533599018.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130e13d2e6d8---34330864715.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/15376539210.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/17735978601.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/qn2iap62v9qkip07gr588rkba2/xiwisakisifedusasowewoduk.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/63989221262.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132b73f8923e---kumunigo.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/97002179595.pdfIn PDF document text
    • http://briztravel.com/upload/files/kuretatamodabivofep.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090114054973499.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/1444690857.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/70091381103.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/94933899367.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/penanerobajoxekozutufefod.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/95681818029.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_off0000dc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 20504 bytes
SHA-256: ddd6a6bda6183bcaddd605f7b747435a7f915fa04c93305e874e54d3b393ba61
font_02_sfnt_off0001299d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299D 10360 bytes
SHA-256: 08f815a4e9c2fa99e369d5774ad5ff053b3e4ac3c07e23e0b0db589080f5afd0

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