Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b70913a5247fa67…

MALICIOUS

PDF

93.7 KB Created: 2021-06-29 17:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2319129e2f9dbbf055ee9e7fc17001c1 SHA-1: e8d91717b7cd5809790e0b01a70d20c1d0398ba0 SHA-256: 4b70913a5247fa6700cbc2c8e070d26b12adaa02133a0add2df5424dde063451
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://drafthe.ru/uplcv?utm_term=the+nameless+relationship+pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ba12e6b617f---gonibazemifufuwa.pdf
    • http://tikatalog.sk/_files/file/firebalu.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607df75b5edbc---gufawupedoguxize.pdf
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/xowisodapidewiwemo.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849a435cba7---tutedijar.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3884e89ad3---41822294368.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/r84qsaqcjiqk4g97a26baq1v21/99322653837.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/mfflvbjbvf5act92u4okmrt52j/lebitekajimexewisutavu.pdf
    • http://www.emailposte.com/pictures/modalinovikekifo.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/djc90f9e8ac7lvh2dsahh2a1l1/36575765322.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070f60f9a2e8---46275674351.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cac3a0442---suwukewufozi.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099a98819ff7---21088371043.pdf
    • http://teplospectr.ru/images/files/11067618559.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0765052f81---81616172588.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/bcc1e84d08362e3b56767b91340e1e70/mitekasabutedewulameju.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d802615f69---90968139750.pdf
    • http://ibconsulting.it/userfiles/files/96390625984.pdf
    • http://doyen.cc/images/upload/File/jimezedodojibigixogunixat.pdf
    • http://attlas.center/userfiles/file/56149392909.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b4dfd7b57---71401928208.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070f9218177f---gabatobinowewolimatuva.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/0h2ugd21hp0fq4gdjdfas0qil7/7287140766.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa0dc970d9---33768821197.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_off00010be7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE7 16792 bytes
font_01_sfnt_off000123fe.bin
3c445b14f381a1bab7c28e81f9f63bdcebd2389cd902d2d2df05572998d8c919		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123FE 10724 bytes
font_02_sfnt_off00013c56.bin
2997480c4baa4dd7fd0e39040871ddee155c73874e158d045805f5848b8521d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C56 17504 bytes

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