Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df3dcd117664f82…

MALICIOUS

PDF

63.3 KB Created: 2021-06-22 22:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ba74f953551cdfe5f1107e341837811c SHA-1: b77a2b5eef21a60a01a6167f41e7874118f147d7 SHA-256: 1df3dcd117664f82a818c3c4f39686e17e13387276a19cc45a3465e8724abbcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm for phishing or malware distribution. The document body, though partially obfuscated, presents a 'Turkish title crossword clue' lure, aiming to trick users into clicking the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://catamma.ru/uplcv?utm_term=turkish+title+crossword+clue PDF link annotation
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1889f0b941---ruxapipawojolesim.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eb4c01392---94969433881.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/fevoxaxoloxogefekevo.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077c631c282a---19800105697.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/mekefufebeloxufusi.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/20335794887.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/pomumokadokuwi.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609fec5399893---27270736934.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609842a3b6f31---69213861848.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/rilixosajugojesegab.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5162e4040---remejezunumajas.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081beb19174c---sirosolasorume.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/69423177676.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/leloniwarexopodefulakake.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/69bf14ca27d06c16e3498edf2441fa82/11150088098.pdfIn PDF document text
    • http://brlairport.com/images/file/84122756303.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/35898004088.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/bemejagegirofuwaregerelib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1D 4924 bytes
SHA-256: 70fa4cb0f08a79d7f8fc306dcc46c69dbe57e00a33274d1749f65ccb6dafb1f8
font_01_sfnt_off0000cceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEB 10364 bytes
SHA-256: bf574f4bdebcbddb24f31528b673dd05eee603ee78d38983f5bbd4a9bf434c0b