Malicious PDF — malware analysis report

Static analysis result for SHA-256 961671cca9414a0d…

MALICIOUS

PDF

90.3 KB Created: 2021-06-29 10:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de055fd943def666bc1026e8ca05b611 SHA-1: 4a6ee34968e8bebeab06796b478a6e164d0f0390 SHA-256: 961671cca9414a0d8948dbe2590f7c261fdc3a26945432b575f2495069e6790c
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. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to host phishing pages or further malware. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious document designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://crewmak.ru/uplcv?utm_term=how+do+you+say+what+is+your+name+in+spanish
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608c472728963---mosezazerapidimu.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607621186b020---lijudusur.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077c2256b737---55681798009.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/36mvi0b6otujh4cli2hr46g3a7/runusamudivugikegope.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/oldhf5aats34agsu8ju0ap5ao0/pilebadekoni.pdf
    • http://robertoantoniz.com/resources/original/file/18881098556.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/18b9a1c21880859c300845d52d0663d5/10559986081.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830ea40519b---3231074440.pdf
    • https://healthmatters.me/userfiles/file/borekenade.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088f3ce65f88---vasekipodasogajurufowaw.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609835f58dbb5---4377187625.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0f1e6d649fe51cfeb7cd7ce58be39019/60961899531.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4387f1c277---belop.pdf
    • https://dailyiat.com/html_upload/file/zijimijerujukexusit.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dd407fb02---61937028225.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090f2d2de68d---16438140247.pdf
    • http://intergeored.com/upload/File/bupamozelerutivovi.pdf
    • https://alkirbilaw.com/userfiles/files/xijavobisadi.pdf
    • http://fantalife.nl/userfiles/file/13918942264.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/5e66dd7e0c9ef8c672647b921bdcbbff/bozovufonevifel.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dae7166c81---lewiwejitemivu.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c445ec421---82684238969.pdf
    • https://grandhotelbulgaria.com/userfiles/file/69160608929.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68bd93cb64---49255950726.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/3sbdnj1g58iojo4r3f350ctjig/xepapaxusuzapamali.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/804a01c0220e2a88efebeeea406243b6/basimesimivoti.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609b422163ed9---jebozilesijuwakaz.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_off0000fb79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB79 16792 bytes
font_01_sfnt_off0001138b.bin
cc7da0b5c7e6e03f55e587615092f396b41b6e3cf490bf90c00998d3d9c43e40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1138B 17748 bytes
font_02_sfnt_off000140b5.bin
3b562cdfdd60a5bea55412652981a37e3ad3c6d22ef4bf6408bc98d5a58e30b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140B5 10904 bytes

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