Malicious PDF — malware analysis report

Static analysis result for SHA-256 594a3ae3631f7897…

MALICIOUS

PDF

90.4 KB Created: 2021-06-28 10:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c773c149ca01911cad1ffc1f255278d1 SHA-1: eb1db9fa1dd296eae79352a6a779f4240f34a3fe SHA-256: 594a3ae3631f789736035953a858d5c8f1e6abcb57d243c3e9efa4d8dbe22727
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://infrive.ru/uplcv?utm_term=ww+monk+pvp+talents+shadowlands
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/d4trcdee5pr2nk0ks2m5qqvpfj/89931990362.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd953e32c---17788129570.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/28311050902.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a70312a1f04---mobapobef.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/125bb3c832817e41a3cc239df3a82e01/34802797907.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5408a7470d---zudinuwakerebenubo.pdf
    • http://sergey-yushkov.com/pict/file/mumitovoga.pdf
    • https://consultingexpert.eu/fckeditor/userfiles/file/xinakufuvizaj.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160797bc7567b2---lusufovoloj.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d85a3951a10---jebikixafilodi.pdf
    • http://jfhcoaching.com/userfiles/files/dawiniku.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089209f676c0---fepipadolivorewu.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b8c5de769---fenawezedegebajabu.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/de94956f449d8200c3fe5f631b55c8b3/39349559633.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092ebb777fad---kufijej.pdf
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804babb6e71---59109539639.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/131f00c776c4667ccc329bd5320ce9b3/98363887982.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a24ee4293---74520792827.pdf
    • http://vitacanes.com/uploads/files/4882461954.pdf
    • http://abimobiliare.pl/pliki/File/gubamofivosapir.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c56fb635105---betunejoxalilixidajapamaw.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dcb5aade5---96057503404.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_off0000fb06.bin
e016c0374223669e6719ea15c01a535e43bbf3ad95639f6309e106b400e6910e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB06 10700 bytes
font_01_sfnt_off00011376.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11376 16792 bytes
font_02_sfnt_off00012b88.bin
e0f0fc1e3dfa1bae2c2dacaf7e687f3cf3df8468799143545e1b7a1adafb3336
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B88 18032 bytes