Malicious PDF — malware analysis report

Static analysis result for SHA-256 cedf57619c34593c…

MALICIOUS

PDF

79.9 KB Created: 2021-09-03 06:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4a7bf29f3ed8abb20cc083ef340c60a3 SHA-1: 10bdb68805f2fed6b7f8bc975db6f4030cb63e8f SHA-256: cedf57619c34593ceeb26bcf925c9550ef1c6cfac3333d1484346d1b1c97c027
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The primary attack pattern observed is a phishing lure disguised as a free PDF download, likely leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=english+speaking+pdf+free+download PDF link annotation
    • http://vekosgroup.ru/userfiles/file/sorejewuselu.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/83246471332.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/5a083bd558475484e2eea937d1f3164f/werego.pdfIn PDF document text
    • https://egf.tw/test2/images/file/firazekisigamategutudojus.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/51267155034.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5df3a13339244b1cd0e37a1e431be479/makelosamanarifaruwozo.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/migexozamo.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/65838114909.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/pesija.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2d69c0241---kuvuxovagem.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/3r4mimj8bl3qhrgktr08dlohr9/pogutapa.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/c811c6bfc90fbaef123530845a6e25a3/81038332247.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8c94f0839---pusemomejavukupine.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c386371949---sudixokagufufobezoxaru.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f2adaf7a8---63487718855.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ffb06a9cb---pamineguzo.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/tuzagozawe.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/82188132845.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/6235afec8a7fbe15f62f4d0d2dea3694/71526098075.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/6f3e599688f457937a0784129f7e39ac/paxenobewolur.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa3100eaeb---76180650095.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/62648324193.pdfIn PDF document text
    • http://quatang3t.com/upload/files/70826560012.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/gutesidifefobex.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_off0000cfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F3 10840 bytes
SHA-256: 80b7d11307cff6d0f1b9810d7a3055d7815d8434e48f122d7f51998cdc33b4b6
font_02_sfnt_off000100ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AE 18884 bytes
SHA-256: f79b41094945aab38209335a7ec3e8c6f62c7a03b6171a54d920e3fe3fb7b56f

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