Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ebe2d634cd125a5…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 07:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a96d57c610d8cb46d76791e36ecd573a SHA-1: f283b274d2603a1fbf26b4be72f39feca581abd9 SHA-256: 8ebe2d634cd125a5618899ca4fb762d449a6a24825e1d94659224fef2a67d50e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, several of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond being a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://eyetracking.pl/userfiles/file/jepakamuzazifamixi.pdf In PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/t625gf2a6gver3ccnescjo35rp/puxudikugowew.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/96916941090.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/nusevopanoxakobagotuto.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/1320027619.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/vugikelolasi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/rfvgi1cbbi2tt2mi932aqriptc/28674088858.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6f7079d10---murajevusadepobe.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/56790309297.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094ad7c846ed---5410521109.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/20747256315.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c290cedc2eb9a2eb111542c1702df3b6/16530897107.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b055ddee95---roxujekukesebapedupanudu.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/11074549188.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/j78ebnfrvsvhvaq7nv2bf3a99b/xirafemorigotomu.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/a52e8440ac8dbfe3bfdce82885fea1e3/fajujaxewitozuzibudotez.pdfIn PDF document text
    • http://seamacros.com/upload/file/namaruxabepukefiwam.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/33952898573.pdfIn PDF document text
    • https://morabia.fi/images/file/66332465760.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/28187638130.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/32034056485.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/demax.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/2c56d28f41a6319ea59e9f2dd7daa35d/zonefewikam.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/lixapasadovitunawigunaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cryptic+quiz+math+worksheet+answersPDF 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_off0000e03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 17952 bytes
SHA-256: 736d27c440cca5ee86ecf155ddd8b71de756df52f5c59fc07416b34e7056c8b1
font_01_sfnt_off00010efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12713 11220 bytes
SHA-256: 927fd00e1034fb564d0f06665452a29b82787fc39b84bff31fc8129dcba0bd88

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