Malicious PDF — malware analysis report

Static analysis result for SHA-256 140887e9a6944b9c…

MALICIOUS

PDF

84.1 KB Created: 2021-08-13 17:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 77b9b20771a62617b6342c2bd759d75a SHA-1: 84fc45cae38d9f4b56917a17237d4d3435627828 SHA-256: 140887e9a6944b9c5a64d31c3bd42ba0b49aab4e78fdd50e51dcb4c438c0538b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure victims. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cructi.ru/uplcv?utm_term=hyundai+tiburon+repair+manual PDF link annotation
    • http://wami.cc/data/files/77681246868.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/96280572548.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/43832460385.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608d995d92d10---dinumexejifejaxojagawoxog.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/478635f678b1aaccc5b4b82a433bda7c/tefofusabuzozimodi.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/cb75a73acd0d8b351964696a56d1e130/tiwuko.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/81ad2e4cd27fd574048d9c441b80ef61/34182225037.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/28904060624.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/46748120792.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/176a9c3fb292301d1772234d392f4612/46667760601.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/dolulotejugare.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/kesorefi.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/45628092756.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1cf821050---xeparajilejivu.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1622850396.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/22974f01a78b3824ccc550e728b8f2bc/25295777391.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160718354db94e---rotowilesawibof.pdfIn PDF document text
    • https://soechi.com/userfiles/file/33691760093.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073bccc90ac8---xapodajulususix.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/shdghfr7rdcbv3l85gb8uutpal/60550693478.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/gafisorolug.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/76922252289.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e92d1694b3---sawagegegala.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_off0000e524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 10728 bytes
SHA-256: 4e56daf7788a74e3372ef5fe32c4fa1309a5402f3718ed6bac9e7b43b169bdb1
font_02_sfnt_off0001158f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158F 17136 bytes
SHA-256: 8ec09250d7ea70acf3248d8c38405ca7ea175be9181e09a33c85140c8a015c5e

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