Malicious PDF — malware analysis report

Static analysis result for SHA-256 9426bb436aea7c96…

MALICIOUS

PDF

68.0 KB Created: 2021-10-03 18:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80d3e65a2bc072f685966fb04b9f52b3 SHA-1: 546914a930f9abeef2523632214bf20344ede66d SHA-256: 9426bb436aea7c96f6a484dc15b1f45d5782606f46e144ae8379456edc05bcba
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, strongly indicating a phishing or malware distribution attempt. The PDF uses an image-based lure, a common tactic to bypass basic content filters and trick users into interacting with embedded links. The numerous external URLs point to compromised websites, likely serving as landing pages for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 68 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://drafthe.ru/uplcv?utm_term=hematogenous+infection+definition
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zikimagoxanajutajid.pdf
    • https://eijo.in/ckfinder/userfiles/files/17028580688.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/6a275dde1170f62426a4de40ced7798d/tomilinus.pdf
    • https://lanegarrett.net/userfiles/file/vofajogakumavurivuwizeku.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d0bba27f5---velumamobulusemamogo.pdf
    • https://contact-house.com/fckeditor/upload/file/junumedodixafapaxekoj.pdf
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/vidadej.pdf
    • http://lmtechsolution.com/userfiles/18775633441.pdf
    • http://jolanyee.com/upload/files/202109021246461163.pdf
    • https://medicentrumnz.eu/medicentrum/files/file/36390950135.pdf
    • https://nezamirekhaseafoods.com/userfiles/file/josewe.pdf
    • http://joy05.com/_UploadFile/Images/file/10594203544.pdf
    • http://fisioterapiasuzzara.it/userfiles/files/kofiwowopo.pdf
    • https://elpollopaulino.com/cenavarra_userfiles/files/xobafojujalojezopojawenu.pdf
    • https://solelane.com/ckfinder/userfiles/files/78798284016.pdf
    • http://abwmountvernon.com/uploads/files/vemitibixemowaxupame.pdf
    • https://georeno.ca/userfiles/files/14181479827.pdf
    • http://ieltsadd.ir/cache/fck_files/file/dubajiwelisakurisep.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bad138817---tuxanafe.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/95921204239.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/dm14551hseb0rs4mf34tm9af3l/23029393788.pdf
    • http://www.beautyvogue.ch/Files/file/40772186926.pdf
    • https://floraplant.gr/FCKeditor/userimages/file/tedukebolodutowi.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_off0000ae5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE5C 16792 bytes
font_01_sfnt_off0000c673.bin
a6013949086cde540c0e89ae627cab8e957c9bebeb3e8b0e565a2afeefb18ec1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC673 10764 bytes
font_02_sfnt_off0000defe.bin
e30a0246a6bf03fc67f240d6de5889fc36d606e0aae889df9653f1312ffe7c9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFE 14280 bytes