Malicious PDF — malware analysis report

Static analysis result for SHA-256 e45f865c6d2c5533…

MALICIOUS

PDF

69.7 KB Created: 2021-09-29 09:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5eaa89735ac5320733e91cb42df65407 SHA-1: 480f063b0a5a2b397f58a9ce17e6e59c3abbfef6 SHA-256: e45f865c6d2c5533f7a1b6835610a9b590f8e6bbcc5109eb7856079858e4d511
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Numerous embedded URLs, including those hosted on compromised WordPress sites and disposable domains, suggest a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=how+to+fix+corrupted+mp3+files+android PDF link annotation
    • http://metrominicabs.com/survey/userfiles/files/58287707649.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/18099084530.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/pejavorigesolapewite.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/47981277651.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/1601ff69e013a9aad70b63dc30c45ba0/fepijugukiz.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/85443814222.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/xiwatafexi.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/jomubilebotabonoladu.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/74161047139.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/tovololudetuvunarufure.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abf247d1b9---28853872504.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/wakevukuriv.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/70856015392.pdfIn PDF document text
    • https://micsys.in/userfiles/file/94962709295.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136675865e1c---27696056284.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/96444161908.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/beveba.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/semif.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/98277334715.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446d0f1872b---34273538817.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/28145416902.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_off0000ac96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC96 11232 bytes
SHA-256: c36ca8736c4cec4c86eb1c824d6a9bb7a576f5f630f868f6b1303a1af4e09a77
font_01_sfnt_off0000c6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0A 16888 bytes
SHA-256: 0aba0cd27fb9535606acd133a8a03f57ebd1d5c92fd06abc367a6b73267fbade

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