Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a22b31e14b4d1cd…

MALICIOUS

PDF

85.9 KB Created: 2021-09-21 19:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0e18c19f67d7f62186311ee1529825bc SHA-1: 9a5adc16acb977a2d6765b7feb53341a1db81f67 SHA-256: 2a22b31e14b4d1cd18066aaa67ef7d0053bd07459d31ba1cdedbbf2576f4c076
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including one pointing to a compromised WordPress upload directory, strongly suggests an attempt to distribute phishing content or further malware payloads.

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://krisoc.ru/uplcv?utm_term=hanuman+chalisa+lyrics+with+meaning PDF link annotation
    • http://zrdb-drogbud.pl/Upload/file/44774825960.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/84550360002.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/woripenopi.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/sajixusebofomuk.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/fuvomataxar.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/96d17d7b1e74a1073785f2345e4df0ad/xilebivafavipuzeletuxuxi.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/41415092244.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/zibifatenaxitawodebuvow.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614490b7be263---68804574051.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/41623121807.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/pijefiwapepuwofenupe.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/buxuzedefaxalusozo.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/safopurebiwijoge.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/69776916001.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/71287177261.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df8f9143ec---losat.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/55004416184.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/87897424061.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/kewowefuxifudewekitev.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/gesarawerunex.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/52946846030.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/niforekikifa.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/84627305980.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/zikunoramiliz.pdfIn PDF document text
    • 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_off0000e96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96E 18532 bytes
SHA-256: b975202f21869f3bfe1474b05eabfab626e997aa3e32f341389756a9ad5a79cb
font_01_sfnt_off000118d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D9 10848 bytes
SHA-256: aabd4334186ff022372b5804f8d0da6f508b53b02acee07e104378677abf046a
font_02_sfnt_off000131b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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