Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8607e7813f2146…

MALICIOUS

PDF

85.0 KB Created: 2021-07-03 00:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: edbb59d543ff9f269170e77ffdf4bc11 SHA-1: cd755246debe25259d2223621321f2f921d02a02 SHA-256: 2d8607e7813f2146d2b08c7073fcc436878193ea5be5c09bca3bd9a5470ba193
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. The document body is unreadable, but the heuristic firings clearly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=watch+pitch+perfect+free+online+without+registration
    • http://krossinkeuka.org/clients/c/c6/c64aa726effa6776341672ea469011e7/File/xotibopetoketatume.pdf
    • https://arabacioyunlar.com/calisma2/files/uploads/tabikaxoxerakixuxodufavoj.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/8beeac7c2e8d27bf3fb1edd5bdb2bbfe/36409756434.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/b546dl4ptlkerfaaeviivvos0v/58064968108.pdf
    • http://tznjl.com/userfiles/files/zisixujuvoxag.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2ae414901---44922089977.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ff96e55d8fe64db90a6c78dc94434371/66243298725.pdf
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/69327163019.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160aa43596fabf---rikavivonajevoze.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160885a20ecd6b---mizetobut.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/551bc3093963367c6bda587156506606/26082708285.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/a18999197fecd78849dbf8f7ecfc0c6f/tiwugukoraboj.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/cpdgkeoclmdjaov4ssf2u5oq32/gavaligesasavuraw.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/f3ek6chpqtemllri4svpaftnf3/56161274278.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97abc43c6---narezemuwuponitawoxemuno.pdf
    • http://wonikqnc.com/upload/editor/file/1623747258.pdf
    • http://sungsam.net/userData/board/file/79693203695.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b450dfe0d8b---vubisidutejadag.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086ac3abfee4---fubigeguvabotupigikuweful.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075abffc6c5a---ralizeluduwotunufusul.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a457b13d47a---nuxewozomofutanibojif.pdf
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430075158773664.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/lr2i05pldu776m98uplc8q1tti/46757799486.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/odk9cvt9qe9184l4ascjv9oi57/52833713697.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_off0000e414.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE414 16792 bytes
font_01_sfnt_off0000fc26.bin
fd393ad1542af9c504db5a8ccfd839942c5f730acc625745dbb1b95623f22e01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC26 17964 bytes
font_02_sfnt_off00012af9.bin
f63172b26f032628511f7a4e11e191a8f20d0b1e26c4d0f3377f180c68cbe279		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF9 10936 bytes

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