Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c049496e7e53650…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 19:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 93c3ba16fa83e40620db3617a81245ec SHA-1: 4d935ce1fe6201a9a2c0ccddb8d9e4bc080d62d9 SHA-256: 8c049496e7e53650fbe10f01e403b4e1991f2eda0ccea2d5f996e8aa66144212
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. The file's structure and numerous links are consistent with a phishing campaign designed to trick users into clicking on malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://serwisnawigacji.pl/userfiles/file/xudorotagobojerawivu.pdf In PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0ce17d37003289f44396d6b05d16b973/nidifelukufiwikewepa.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607983bf2256d---51874928851.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/10866787685.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/29041810041.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/roluralifawirafexo.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/xirozuroduvafopoverusub.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/54232219218.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/fusipiredodikul.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/76574709325.pdfIn PDF document text
    • http://drironcat.com/images/file/69224121089.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dfd8413e7a---xodotosigumalibaseg.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d3b9d2ca0b2a4513c0c6a7937912f315/fiboxabupevodatitufibaki.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cacf80c11d---tagirivakikojobabuvabe.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/balezonubadusez.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/31103645451.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/45441693719.pdfIn PDF document text
    • http://aplus.to/userfiles/file/nikajida.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/32220478400.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/74596908373.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/zoxipa.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/78580636281.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/71335137570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=california+dmv+manual+2018PDF link annotation
    • 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_off0000d65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6C 19360 bytes
SHA-256: 764b4b18d12e2cf9765802e11d5bbf2a0eaea2757fd191547a87224829a4dd8e
font_02_sfnt_off00012077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12077 10816 bytes
SHA-256: d017b240a139a4a0025efc12cbc8d85c76f32d9975bf12d5ccd119af9a7cb228

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