Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f910cff97f51aaa…

MALICIOUS

PDF

87.2 KB Created: 2021-06-27 14:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf4105b82eb49e257bb0edb9a1c0bdef SHA-1: 9dde6c066b5ddd38252e2ba3a61e085d0f78302d SHA-256: 6f910cff97f51aaa97a538684c1d31f7334fcc14f2d1e0ce11a859cb4689905e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised CMS uploads and disposable domains. These links are likely designed to phish users or redirect them to further malicious content, aligning with common phishing and social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c84u7npf89h38v1bb52880cqf5/jalovebanewokijem.pdf
    • http://sbs-group.co/userfiles/files/kalafupizepapekoxufufew.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/80355940745.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/70174e9426d4e36abe6da7e04316a11b/49080215750.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b7c718476---nopitalalefonofom.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/a0e69ad2cf79416ca859a4f74ee8582e/16266692451.pdf
    • http://gtshotel.it/images/file/81755363217.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8ebe32da1---80884265828.pdf
    • http://optykglowacki.pl/obrazki/files/8704919097.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c70be4d37d6---nopuwebitanujijikuvimosos.pdf
    • http://unipsyclinic.com/userfiles/file/20210624195720.pdf
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/gorupuruzaxeduzajanow.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/5p1n97325tcpn9ci8o5vj1ldd6/komogekizedupe.pdf
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/vokuxi.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/a8cee732149987428e0cb1251613a270/23202663245.pdf
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/69930555061.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/l78hm0f4g6cae0197t1qmf4786/novigakipuwovi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48865a752e---repekulufuwimakixepomupat.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c80a9552f0---tosasusudikatakimix.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099dd3f14529---70719806893.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c402b87c77a---wagipedobuliligotesogexu.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff56d27885---jodotamuvuze.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe54246915---38556169767.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1fc45d6f9---gidijamafut.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c950869db6d---karixekoriber.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=chiggers+and+dogs
    • 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_off0000f526.bin
cc7a018e5bf2af262bc812c8b4afb58bb9e6a14c14a99c9c5b04ed77bb145ccf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF526 10412 bytes
font_01_sfnt_off00010c76.bin
2e2ad82c816e3b23cf84fa7cafadca5d543f9b6260850652e8993a0f5fdb56c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C76 16604 bytes
font_02_sfnt_off000137a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137A0 16792 bytes

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