Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc03adf0749576a…

MALICIOUS

PDF

82.7 KB Created: 2021-06-25 14:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec0b523384d84abd04309b00926209f5 SHA-1: 608c19787545ca798611517f58843fc9495c054a SHA-256: 4dc03adf0749576a18a8d3a7ed1ff7cd656ac1c79d33ad693a1d1aca1e7d5e80
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This pattern suggests a link farm designed to obscure the ultimate malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nomylo.ru/uplcv?utm_term=malignant+neoplasm+of+overlapping+sites+of+bladder+icd+10
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073f5a5913cb---najinogukisap.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d7c4d1673228413bfd2bf82d792058bd/wulemarenine.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/a2t5n3cr7h3vjcgd5dhif3s2l2/sigobunilepolipa.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f49c44194a---gizojuzotejujusobobomeva.pdf
    • http://gleneaglehoa.org/images/file/kobik.pdf
    • http://vietsaovang.com/uploads/userfiles/file/50321272299.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d57d597a453---83036921523.pdf
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/vokozobijamuvuxoletux.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b227835db04---nidam.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c749a85d7b5---30861181869.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607696aecf564---23689582099.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a64cba53926---13514386211.pdf
    • http://www.ecostroyservis.ru/File/31363766431.pdf
    • http://universalgroupautos.com/files/others/kibaxanafokezoxozepurez.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/4dtdpjpp0peb9rt0rb1iu2qt13/82028447260.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160704dd43e29d---fesomewazisikuxogem.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e13e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE13E 16792 bytes
font_01_sfnt_off0000f955.bin
c1fc42196ca0cdcba8b4f745d19d9993b8ffed93de903ea522b300e3c50e78df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF955 11336 bytes
font_02_sfnt_off00011399.bin
228d3e8dae872449a4d0adcbb2f45991128f4bc7bce8d5b9dfb0b514e354ea7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11399 16184 bytes

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