Malicious PDF — malware analysis report

Static analysis result for SHA-256 90dacbc397df3d07…

MALICIOUS

PDF

85.7 KB Created: 2021-07-07 07:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06968d64ca521187c6ce73e707a82ced SHA-1: f78fcbc5359fb7dbcebdd6d5105632abf149617c SHA-256: 90dacbc397df3d07f9743f83a41dd55e22fc7fba13abbfed63671c40f7bcdb40
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious PDF files hosted on various domains. The primary purpose appears to be directing users to external, untrusted content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=what+is+the+difference+between+analyse+and+analyze
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/b8acec3ae185347d604b30b4ac72bb11/bagebokuviduzuxuxebawixab.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3773a6c08---86712240568.pdf
    • https://sherwoodchamber.org/ckfinder/userfiles/files/wurixegonewok.pdf
    • https://panificiopasticceriabattaglia.it/file/depami.pdf
    • https://polnische-zaune.de/userfiles/file/zobizaxanidi.pdf
    • https://aspaeng.com/files/image/files/taxeguru.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078599a4faf6---42417106702.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/17dl0p2u77bdi6iq7f4papflvo/powutotuniwaduse.pdf
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/gujazumak.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/fo90vpou9ht6tjn3sdbr78khgr/66381302462.pdf
    • http://studioboscono.it/userfiles/files/79366427304.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/e3938df42e85d676abc367fc8f2f859d/livopomegab.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093231b505aa---bujum.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afe4c1a560f---bamobitugaj.pdf
    • https://poolpoint.be/uploads/file/zabeledolapokolapibipete.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094600636d1e---8040871749.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/dopefukixiwadabeforeka.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8023a6478c81040e6efbeb1bcd72511a/povidapaxipelatalerijikid.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db7178844a---jawenupetikasa.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc25f55a89---lawanegivivevusoxovek.pdf
    • http://cesurmakina.com/userfiles/file/38255550428.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160820503e8770---morekitixuboli.pdf
    • http://vinabomi.com/uploads/userfiles/file/84933629468.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_off0000ea54.bin
dc2bd89d6d9ea34d55a1790b684f4b94d8a4977012c971498f0fc986b56bb424
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA54 10844 bytes
font_01_sfnt_off00010363.bin
6c1f7a9e9b14c2d86b789f70fe1b65299cc5aa54e264043ddb8e03bc5dfae09b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10363 17432 bytes
font_02_sfnt_off0001311a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1311A 16792 bytes