Malicious PDF — malware analysis report

Static analysis result for SHA-256 59358fb35fb33098…

MALICIOUS

PDF

87.1 KB Created: 2021-09-06 18:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 36dac1f2c2ec22de5b300c1a86530d40 SHA-1: 372c6f4ab7d1514c264f04d4ffa528aa788f61c3 SHA-256: 59358fb35fb33098fe26533f15e6d994608f16c2346efdc9c0bd6eeaf31b7955
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for SEO manipulation or to distribute further malicious content. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and the overall structure point towards a malicious document designed to lure users through external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://oniceh.ru/uplcv?utm_term=top+10+manual+transmission+cars+2017 PDF link annotation
    • https://cornwallstaffagency.com/userfiles/file/92500624749.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/6114282149.pdfIn PDF document text
    • https://tonycustomtailoring.com/nbloom/fckuploads/file/lotamesisibenofuveditilil.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/wezoxizifilitevux.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/5boff0731c9qcgtoqsqn5af1lo/nodunafemomusowosagut.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/ralisaji.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa6884bfe0---gululaxida.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160eca7b168e8f---tamexokam.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160f1e30c7f823---37056231337.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a80f4372127---zukebovev.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/40721478510.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/jabarafejelowabotezu.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/xeperolubiwolexenevap.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609417f174aea---vorerer.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2e49680dc---72540956816.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/sikit.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/41792752395.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210730100208_g7mfcu.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/38949172705.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210619200134.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/lenagazutopogojo.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/kudiwibezimiruleganusa.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc5321387b---kalopazowegoze.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/46877227650.pdfIn PDF document text
    • https://olterus.com/contents//files/zadivanebapaj.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec1acacdc6---dosolonitimaga.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_off0000f16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16D 17208 bytes
SHA-256: e79ad3d10f59662b82926b580e7a3631cbdb691cb3879eaeb93684c17f325948
font_01_sfnt_off00011d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001356b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356B 10808 bytes
SHA-256: 7423c25e3177d5812141f088c7bd064aab8e4ecab9250a525a94b39c4ed159d0