Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1c1faf48985a24…

MALICIOUS

PDF

87.2 KB Created: 2021-08-15 06:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a63ecbd2d7a77f1b5f77bd653fafd5b8 SHA-1: 529249c104ab4df4e53ac06756f83b55381f6109 SHA-256: 7e1c1faf48985a2400ce3a87f7b2cf3d0f47e1122d0510c53528ed1898fca35d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous external URIs, many pointing to what appear to be compromised WordPress upload directories, suggesting an attempt to host or distribute malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=church+of+god+in+christ+sunday+school+lesson+for+march+7th+2021 PDF link annotation
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/gmekb9ltdjo57epnifr892223j/tigawagiwapilovafimuz.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16081f835b8674---minufoso.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/96274851105.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/dexumomisopuw.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/82830876821.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/7c82db812230995c01abaf5252255fd1/wagerel.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/26681082788.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096c3fcd1ac4---47350476165.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/zisinuse.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/80764533682.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/54681065593.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/90496360445.pdfIn PDF document text
    • https://tarsiman.ee/files/file/63410823503.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/76463630206.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb78851c43---sowemikiduxaka.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b15745b633fe8fe967df197c3b45cbb5/45100507930.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/5319099382.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/72962334163.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/kuxanurusimiga.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/wubovabanamom.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/40788632869.pdfIn PDF document text
    • http://merwepizza.com/upload/file/94862114497.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/73aujfdkr6crab2pf25lbavvsc/vilowavid.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/rapadowe.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_off0000eefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 16652 bytes
SHA-256: 2d8add4e7d74d2c6985e1877584269519e9bbb7d2eb0f586e63ebf40eb000b72
font_01_sfnt_off000119f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F3 11512 bytes
SHA-256: e8e54f55229024857c267d81c4ca41b572753e7f659a8ea31dd66c658aebe28e
font_02_sfnt_off00013509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1