Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3246d345af9efc…

MALICIOUS

PDF

70.6 KB Created: 2021-09-06 01:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 520fe1a67ab25b898c77bb2e385fbf69 SHA-1: 74c658ac7d7f9cda1d1e22a15055b148d86c7443 SHA-256: bf3246d345af9efc1bb9c737d7012c20df554aac9965b2b6fba93db8d61ea543
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm designed to redirect users to malicious sites. The PDF structure itself does not contain executable content, but rather serves as a vehicle for these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3fa56834c---5426088559.pdf In PDF document text
    • http://ksnjl.com/userfiles/files/48758643052.pdfIn PDF document text
    • https://noddy.nu/images/file/64176972647.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/vebufadenobabaxexel.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebb4409f11---70632938645.pdfIn PDF document text
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/50642638758.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/bpnmjeb5mjf960p499ije2fkgu/vowufid.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/16752850085.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee56a16a0ea---99757758977.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/bubobigivirip.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/29854015742.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ada6627f94b---93453385796.pdfIn PDF document text
    • http://cwesp.biz/upload/file/togijakuvi.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f47f7ee89---32730330512.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8889a907f---39719428312.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/90062570549.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110771d3f3fc---maferijuvazifama.pdfIn PDF document text
    • https://o-dance.com/upload/files/xanipewekumudoba.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cadd387ee---soniki.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bf8aa0d31b9---6434514709.pdfIn PDF document text
    • http://airfa.it/userfiles/file/80350493217.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/29411119453.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6ed1cda4a---20117685844.pdfIn PDF document text
    • http://stillwaterponies83.com/clients/74660/File/jidunukedebupoweroza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+curmudgeon%27s+guide+to+getting+ahead+free+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD0 16024 bytes
SHA-256: e227570d966f20b60bf610f4f0deea314b5596cdb3a9f177d01f0552f9aa5564
font_02_sfnt_off0000f339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF339 11120 bytes
SHA-256: 8810be5a474b96372f40a2421f8e5692d988dd42d9331b9fe01839ed99767f67