Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f0f1a65b4741430…

MALICIOUS

PDF

92.9 KB Created: 2021-06-26 12:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef0b75ccfd4167515bd410fe23ca5ca7 SHA-1: 9e322086a089f8cda163b3f8855d3ef57ca43479 SHA-256: 9f0f1a65b474143007e2e60397249d8b57d0d31b8c0e900bf88da8c8c62192b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, but the presence of multiple suspicious URLs strongly supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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=mashed+potatoes+and+gravy
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77eeaa09a7---39082216346.pdf
    • http://chokmanee.com/userfiles/file/lapekajakipozew.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/94a06d2681d54ce191c255609d6e4aef/75412510891.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/8bf56e4778b5dca5d24f5c9bc25cf377/fakesidasezilume.pdf
    • http://wooshin.kr/uploaded/file/71487487360a4f1bf69bca.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609009a2e5991---23438850804.pdf
    • http://hilltop1976.com/clients/24685/File/dotojilus.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6ae45b9d6---71235248358.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/a800cf6f4aec6b3bd5788042f214654a/15416890490.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ada107886a4---tikuwobafoxo.pdf
    • http://huiking.cn/uploads/file/200958328743.pdf
    • http://jncs.kr/page_data/file/20210621002442.pdf
    • http://crackershrimp.com/file_media/file_image/file/33816473052.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/88f511fb99f56ef1f9cdc4002c0302d4/54786281140.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b52f3d018cee8af6d4179d439b55c046/29228437392.pdf
    • http://doktor-okonski.pl/uploadimg/file/79393658215.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/0aef7cdb255c9c8c0ef2a28dfbe8c8a4/38902294842.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9da5a48d98---4430856366.pdf
    • http://cmtdental.com/upload/ckimg/files/pomixuwerivo.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc612ed516e---20615981693.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_off00010871.bin
e78ea561d0d6deea36a22ecb0f2aef7131bbb90dc38ce8dc82e793c5ff41f5ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x10871 10708 bytes
font_01_sfnt_off000120ca.bin
4b0b984fe75fc6d1fe5d0bc09451c93715cf370d94362b79f2016e29d0bdde63
pdf-font-stream PDF embedded font (sfnt) at offset 0x120CA 17784 bytes
font_02_sfnt_off00014ec0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC0 16792 bytes