Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ac3f0eb3ef1062…

MALICIOUS

PDF

85.7 KB Created: 2021-08-16 21:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8a311e98eca6219b87da62fca89412d1 SHA-1: b4659616da4660f2ca2a1c180f07ec7f31df7122 SHA-256: e9ac3f0eb3ef1062980e627002e5f5a9d8bc28a67e041e75a4f105078d6df382
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or link farm attack. While no scripts were explicitly extracted, the nature of the embedded links and the detection as a trojan indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/uplcv?utm_term=how+much+are+howard+miller+grandfather+clocks+worth PDF link annotation
    • http://alliance-ic.ru/uploads/file/69280749521.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/86237368022.pdfIn PDF document text
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/kejitemez.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1625178350.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/a0e17428598afeb9c38007b7ce75ae1e/58671764269.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0872683bd6---12977288317.pdfIn PDF document text
    • http://altinay-law.com/images/file/mesejaxaveki.pdfIn PDF document text
    • http://allycatering.com/userfiles/bitelagikefegubivuvu.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4de39ad569---37145470553.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/44305503481.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/46139415789.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/58529783306.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/vasikutovepe.pdfIn PDF document text
    • https://panama4d.com/contents//files/30247286261.pdfIn PDF document text
    • http://arablift.net/userfiles/file/93913287144.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/vebos.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad9b6e89c9---nefufasapuvijimesarinujo.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/minajadeve.pdfIn PDF document text
    • http://scmsalliance.com/clients/864514/File/nagerelusivalopututarufi.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_off0000e5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEA 11192 bytes
SHA-256: 4935f0274e0e427265bfc89ce503a0ca9a67d78c70a4fe679c852e40f01f7c19
font_02_sfnt_off000117bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BD 19192 bytes
SHA-256: ca34c7777344cbf7bfac073768f437217fd5797922ba65eefda3a51317927765