Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c8eaf6df950c9c…

MALICIOUS

PDF

93.9 KB Created: 2021-07-02 04:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3c97b32a59c5a9df143b8dd5fb115f9d SHA-1: f1f76a43044bff6c9d8f240cf73556881520d4e4 SHA-256: a7c8eaf6df950c9c34e8b69950d2be4dc05be31709996060ae990aaea432d623
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. While no scripts were extracted, the presence of numerous external links suggests an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/15524913901.pdf In PDF document text
    • http://pima-alarms.rs/slicice/file/gisatutuzegaposozez.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb7e0ea01b---vamizaretelizivu.pdfIn PDF document text
    • http://www.moyekolodin.com/files/12295300037.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/gaxijewes.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfc098d743---nerafalunevogid.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/0a2f4a9a8e649ed991cad2758747a72e/balaxofujiji.pdfIn PDF document text
    • https://airshow-bg.com/file/jisazefonafinenege.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/26572609602.pdfIn PDF document text
    • http://superpart.com/files/8544651956.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160744b58bdba4---68900427658.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/rivupubuvigidaso.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/45201475894.pdfIn PDF document text
    • http://fitviewer.de/files/file/nazoxunanewapovetexud.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/5a1a3f303ffdad157801458290d19e8f/5401060940.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/48654f9c4aa34443ff3ce069f622f221/41699138938.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1125d15bc---kumirutekezaf.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/tuxadivepejirebadugo.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/6538189faec25d019e77374ab72a0013/vavatefovubebedejuja.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/kevet.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b135b171da7---57669709047.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0404c67b4---88084332070.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/eaab85ff6fc6b1ffb341bbf5d17169ac/87061201500.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c503564a29337a32d4132e0cba7493c5/31282965593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=5+paragraph+opord+examplePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D01 10516 bytes
SHA-256: 25b323f50766e6b0ee40f0b8e05f721effbe8547c132dd49b81e866f465a657c
font_01_sfnt_off000124b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC9 17500 bytes
SHA-256: c9e05aac6c6285ca55dc145199d0c68cdfb6b276472c64581f73f8bf1b488d18

Open this report in the interactive analyzer, or submit your own file for analysis.