Malicious PDF — malware analysis report

Static analysis result for SHA-256 36cf305a691768b7…

MALICIOUS

PDF

72.7 KB Created: 2021-09-08 07:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f5b676429b90da344a25a37602933b8d SHA-1: 159e81fe687015d576a3547d5d9468cbe8d82972 SHA-256: 36cf305a691768b710c22efc12ba996c0466ef575a31cc404564e861eb2024e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous disposable domains and compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary goal appears to be directing users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=dji+mavic+pro+repair+manual PDF link annotation
    • http://020tzs.com/baige/images/userfiles/file/rewifaxigebese.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/poxigukufetev.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763c964acba---97017031787.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/nubenujorutokege.pdfIn PDF document text
    • http://plncse.hu/php_data/file/rifena.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/7df6c98a7edf45d1bea8c03d76227d77/66943794504.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d940fe8e21---86330203397.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/janonenetola.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4eea5e18df---98193939844.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/07/30/file/20210730_122837_198.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/tikabagukazudulube.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/wopebamuru.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/fisedafu.pdfIn PDF document text
    • http://limoride.net/gallery/file/91081210889.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/104832eb3a07e87533a05cbae6c6aea3/rarud.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/20287833774.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/9888a174c92ddd85e8771917c37ae554/58536094983.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6787ee0ab---dokapelopivugitiw.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/vapodurudowunagezepula.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/73815123789.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/4bc1ao7pvjocp8jltcjtickhhn/56456986399.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DE 18592 bytes
SHA-256: ab273a1bf5c8615e6a5bf37b8a6d4dde9548029212314861329da66075865978
font_01_sfnt_off0000e535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE535 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4C 10568 bytes
SHA-256: 07eb6a071cd50f339e49264b1513638661eb8c0ba005077b0d54c7f61c3d594b