Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fd4b3aeb93ede5…

MALICIOUS

PDF

70.0 KB Created: 2021-09-06 03:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2f0a3a16cb0623bdc317252921908b1 SHA-1: f5d2deaf581fc1f6f4ff665a911ff503d6ce779a SHA-256: 91fd4b3aeb93ede5e7f2f25c2528a750d9d3fdf9225f9552f9b85b2c1f5c1621
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. Heuristics indicate it's a link farm hosted on compromised CMS uploads, suggesting it directs users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/65406bc67e0b4dc1e352a01fabea16b4/ginemamoj.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a78c3b75f74---97007508037.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ee6bd36883ervb4fj16kkud9d4/24808702169.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e35750ce0e1---vutuni.pdf
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/85085277614.pdf
    • http://fine-cottage.ru/userfiles/file/nulizeko.pdf
    • http://huucodatlanh.com/userfiles/file/rufubenitagidaxoxaxiri.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a59ab6cba23---bunukojejugusitar.pdf
    • http://pi-consulting.ch/download/93007494137.pdf
    • http://www.gamylai.vn/uploads/files/ronevoxutuvasagabutuda.pdf
    • https://egca.fr/userfiles/file/dugapovekilinejol.pdf
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tubijos.pdf
    • https://lee-trading.tw/archive/upload/files/ditematisodunas.pdf
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/71942142380.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094882969ddb---98204578282.pdf
    • http://liffeyartefacts.com/fckimagefile/file/72842043025.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/2cdc5d441d9d591ec1bb1f46ee8ef292/pezavowatanoxa.pdf
    • http://china-engine.net/ckfinder/userfiles/files/bavefopogevax.pdf
    • http://tencanpowder.com/d/files/34540430820.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160abe18c2866c---sitikolarag.pdf
    • http://balie.overeembv-profielen.nl/upload/files/wureremumerok.pdf
    • https://evergreencans.com/userfiles/file/77551442176.pdf
    • http://55thocscompany.com/clients/62662/File/80849130315.pdf
    • http://arnold-sitter.com/CKEdit/upload/files/durotubaba.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c21f6881b---wavafiwufewupufan.pdf
    • https://cupanghitam.com/contents/files/10404460573.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=inverse+trigonometric+formulas+list+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_off0000b617.bin
ebf0d836a7ee51b2ec7ec6177d3785afbe43aefbd0e6ddcf9ad89ec653b5d9e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB617 13976 bytes
font_01_sfnt_off0000d859.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD859 16792 bytes
font_02_sfnt_off0000f070.bin
0c98bbdc962145e7653dc35205a79d470a58ead7e3bd24e2caee80e3f088e3e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF070 11080 bytes