Malicious PDF — malware analysis report

Static analysis result for SHA-256 39cd3826f86b9387…

MALICIOUS

PDF

88.7 KB Created: 2021-06-28 17:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e9c91fbe38d8da98d520dabb47ad7b7 SHA-1: ba71a5c1247878aeb348823bc8e5e8894f76c2a9 SHA-256: 39cd3826f86b93876d2f6891a41d2f242102a08962aed1b4311466f0e3aba0f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The ML classifier also strongly indicated maliciousness.

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://ketchas.ru/uplcv?utm_term=mass+flow+rate+to+velocity
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/37248a5a482c870cb0367a79fb21d012/12310890772.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/956a962ac0e0e463a37e83f3351cb45b/jamemol.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/b13643a0003e4097e657c09c11255f3b/katunajiwadefe.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51ae29200---56630748351.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a459eb4f4---pinonupapumusaso.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/bd270a1ca260a194b9f51469b9258d36/14044226619.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867a92499bf---pegezatoxovanogin.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608568738ddb2---tosuxedobuluxenupur.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/a7e4c4e3e091cb05a01d660a0e4d7a51/zoxipirifatofajebajupizo.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/e81d2556dfeca1c7e698233f1f10b6df/sidunugaxulotomu.pdf
    • https://soudurelauziere.com/upload/editor/file/malixufisuporazimegodo.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a6699ebff---32862604781.pdf
    • http://tokstar.com/_UploadFile/Images/file/pusamekanaxifurixisadifo.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/328fdec661dee5606cb23cf1c8ecd455/jajamazakejisi.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160adb70f1d00f---31305744010.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d4489dfe1---57592848320.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c255ae9566b---8207818673.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c8d360c93---towivubetosivoxalosupeje.pdf
    • http://washchienluoc.com/upload/file/94300368587.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b51c1a43b2c---49370514013.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/e32664e5963dfd921042a4f81de451f5/44227148870.pdf
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/96tgpb0mfoibmimm25m6l8athm/60101101668.pdf
    • https://mfdesign.hu/files/file/nipugidipuwe.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d96a3dfd24---60710291194.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/bo09rr9ge0mms4b2hhsl40up1o/gagonizasulipesasadepifa.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_off0000f8a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 16792 bytes
font_01_sfnt_off000110b3.bin
c4f24569e1077579fa0061c4b0a518a5f7b52c517cb3d84f9238fb2da083a4e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x110B3 17296 bytes
font_02_sfnt_off00013d90.bin
b181a615fdf010fb847db6614d7af92de1a09cbaba5d0c3609a40773e502cd40
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D90 10484 bytes