Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77722a2a00976af…

MALICIOUS

PDF

88.6 KB Created: 2021-06-29 18:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff83da258905e86225c54dc595b2891a SHA-1: 9f880fd7d94d7fe25321448b4967ea16f3049dfc SHA-256: a77722a2a00976afd2c3a87d4b53a39d31f6776b639b6b61bb1dc49509b440b9
164 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, with numerous URLs pointing to compromised WordPress sites and disposable domains. The presence of 'SE_INVOICE_LURE' suggests a potential phishing pretext, aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=solution+manual+intermediate+accounting+3+valix
    • https://calmoinc.com/upload/editor/file/54279322200.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2b2a15a1eabefb6dacefbbfcf7f1d2f0/75648938278.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/dc4c99a7fe24d79fcd47acba7a4e1796/fewegadogaguravitelo.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef44e00c19---vokufojewujuteve.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a5301818ce2---filovesotodabinekobidume.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0382d2d782---nijaligikoxazewifoju.pdf
    • https://cengilli.com/icerik_images/file/78452303910.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/720ba9bb553047f180d1867fd0b109d2/6588369347.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/cf4a5d6298a649c3c69a9942bbb55d89/90678772106.pdf
    • https://dursunguney.com/userfiles/files/28232197237.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d40edb79999---dapubowedefejirojux.pdf
    • https://aarhuskortet.dk/images/file/duwamab.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/e9314a6f263a236ed610b1f17011380b/1459512892.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/ec9dd7014ce83bda8c3504a9dfc7981d/zesal.pdf
    • http://sibinetweek.ru/userfiles/file/93418854937.pdf
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/13598069197.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d22ef486ff---fofatuduzakosaginewix.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f0d8b1cb0---nowipofupawenesibolafex.pdf
    • http://turagent007.ru/userfiles/file/dirosemuvenanemikil.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/4cb687415d99ddb615e90f02e54cc559/97338068892.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ac3f1e63f---vegima.pdf
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/sol0nltskpajktdo9n9q0m7ps1/wupalonavuzugebumugikape.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/9cb7ccfe62c718b33cfb5ff1fd0c93a1/69344794815.pdf
    • http://alituncer.com/userfiles/file/fojezevuf.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_off0000f51a.bin
ebd16465a7b254983b5933d3d1a741f2dbee69e2d379e09a01041b842263e5c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF51A 17444 bytes
font_01_sfnt_off0001234e.bin
c2e4b9e676f9882079fed64cff5695279fc2866298f49bd78f80e52a447f70cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1234E 11060 bytes
font_02_sfnt_off00013ce0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE0 16792 bytes

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