Malicious PDF — malware analysis report

Static analysis result for SHA-256 89194ecd4b73e168…

MALICIOUS

PDF

78.3 KB Created: 2021-06-26 21:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f61db8a558a4874fb40fffed96d5ce5 SHA-1: f616d3147385f8c7831b630e94e448b5fdbc03eb SHA-256: 89194ecd4b73e168b2ec1b664fd384547eca2615175a19d286cd7246635d9f78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. ClamAV detection and ML classification confirm its malicious nature, likely serving as a lure for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to exploit user interaction via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://crysiq.ru/uplcv?utm_term=class+9th+geography+notes+pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/semevg8ptcib3v02klmi8rpdbi/desuzeboserefefiraf.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085cb962835c---vakara.pdf
    • http://geostudio.eu/userfiles/files/mafusirumenakewe.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc352edd5b1---60543315674.pdf
    • https://systematix.pl/userfiles/file/10241602252.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/558ea9887e237d54708fd649b406c547/mitonagiseme.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/e73ae058d0090a69cbbb9ae9824a1696/wuwujokoxobujizexedered.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16090ff1932cdb---vatofanelimulizi.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/b5c54abbed69f5dfb07e48b22636c70e/naxuni.pdf
    • https://serwisnawigacji.pl/userfiles/file/99325564707.pdf
    • https://festival-bg.com/media/ckuploads/files/14221365842.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/9j3sikjv5kuqsol5vbd2j2d6o4/94905992912.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e84a240628---40592421162.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/htglp7ebbbjl53u8euac1pbb7c/kidosikanaga.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e26983e99c---pelunapetidolegakibuw.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873d7ded423---webefanuv.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7843542a3---xotameluwajix.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf3b54a615---59832913926.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc260c4e9b---xixivagiritodovamidofowe.pdf
    • http://espacioschillout.es/images/admin/file/jikafinorir.pdf
    • http://bilmatbasim.com/userfiles/file/dusotitovo.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160960f02554c7---86368607693.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/23pmh88jv9fhdfol7n6bn46ev9/61238870343.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_off0000cfb9.bin
9be3bfde2b9a85ed44fd97efa96fd0f8969c17443074d8073f1122dadd17eafe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB9 11000 bytes
font_01_sfnt_off0000e91a.bin
41502e0ea0f1f3ccf127a39fff9ff360e2560e6b4f7d48c21e48f3d457afcffb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE91A 16572 bytes
font_02_sfnt_off00011414.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11414 16792 bytes

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