Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50e9d3632bb83ec…

MALICIOUS

PDF

109.9 KB Created: 2021-07-16 16:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f53c54dc825adbc05f3d8e07df39198b SHA-1: 917116e7935dbcfe92d9ae1ee4e4a42ff2cdccbf SHA-256: d50e9d3632bb83ec07089962191c50243e4d4f99d0ac93fea657ae918f76e414
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://krisoc.ru/uplcv?utm_term=chronology+of+events+in+world+history+pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a94a2879548---daruweku.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec9534bd6c---fovewadinari.pdf
    • http://rts-3.ru/upload/files/88486049084.pdf
    • http://atek-ent.com/upload/file/48316754465.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/79988edec5a02ad7bce65af51b029159/jurakobodo.pdf
    • http://koszyczarek.pl/userfiles/file/felewisojibadigiti.pdf
    • https://rmp-familienanzeigen.de/cms/files/36542861322.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/945bab800c2042ba8659fac67ce2163e/vusuzumipopasiwuduz.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/02qnstu8ap4k1bh89asv56e5o1/73694366204.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772e341d7a1---75215459282.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e60b3699992---9352670114.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607349ebb2145---88676462688.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160783f32c9f4f---bowagiwuriguxigekomorale.pdf
    • http://esistore.de/userfiles/file/34525363635.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607892f08336b---54756769691.pdf
    • http://simonide.org/userfiles/file/nafejomibanumevavozoroja.pdf
    • http://brixtontaxi.com/survey/userfiles/files/9821537813.pdf
    • http://renovator.cz/files/file/21211562327.pdf
    • http://hpmcfamilyreunion1968.com/clients/83891/File/92592688844.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_off00014b6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B6F 16792 bytes
font_01_sfnt_off00016386.bin
7b3dc9ad1401346f86ab39a6799cc43beec14069347630c63b38220235fc808a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16386 10912 bytes
font_02_sfnt_off00017c95.bin
41da0b7965267fd0afaf19258cecdde7fafbe536e742193ef073797ffb781087		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17C95 18148 bytes

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