Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d6df9cdb42639e…

MALICIOUS

PDF

101.9 KB Created: 2021-08-19 15:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bd737195925699f880866b9d90b5619a SHA-1: 3448205ef21ea64da96b76a0cf0332adba036271 SHA-256: a4d6df9cdb42639ed8c31531f6ef582f0b769d2109cc90ca13012e6636919db1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://museeducuir.org/upload/files/mirejapapavugozibuzu.pdf In PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/361dd98bd35219ee1517ff143537cdab/66183686241.pdfIn PDF document text
    • https://datajournonepal.org/files/45081676337.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/93607513869.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/kozekonusanekovizub.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/f9d94693fe6ef2a067202f27bfd8a6be/fuxekadozepajatajega.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/6a2ea3aaa086445f1b1000b2c0367d43/17447615322.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/c5f920ccde8ed0f0e39674ce08c76753/wanojaj.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/66275666555.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b52f75ff52---90460695625.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/nezelise.pdfIn PDF document text
    • http://praguetransfer.com/files/file/lulofivibetedininapufet.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/48640190748.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba287f27b7---98624168934.pdfIn PDF document text
    • http://teraval.cz/res/file/najonizega.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/363cab8dc66ba4aa566ec99b7396230b/9035809880.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889c519fe24---66659582188.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/33914140499.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/22486603590.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/59675010136.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f68294a8b0c---mogewizawilodaxiwupafe.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/77106519849.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/6e6b6f6aba44c2e2640d425c3d22746d/41378312199.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/563e11cc7cf9433fb98e2ab3d427610e/fokupilibabopi.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/mejabebejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=can+you+get+btd6+for+freePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12973 10776 bytes
SHA-256: a9596eea31f4891b28cb28050d67ff8e57f0c814eecd7e6c208567b69d2378f0
font_01_sfnt_off0001424a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1424A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A5C 17512 bytes
SHA-256: d4ef60babb2332f04993890bac9e60b62edb95a739a47fdbf6e389f26d0aa84e

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