Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfee5910b098ed0…

MALICIOUS

PDF

70.4 KB Created: 2021-08-28 01:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88f7a465533f37cba6737ca475e883ea SHA-1: 3ca3d29dd1f77cbfc4bccfb65cb8ac5df6966707 SHA-256: acfee5910b098ed033f9d399afd6fe14cdb57f957e9f72fb796a3a65d756c3db
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. These sites host further PDF files, suggesting a multi-stage download or redirection scheme to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://fentesmakina.com/paket/upload/files/xavomefi.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/kgtusq8l9klf1tdrua6c24d7vo/worifemapejaxosejexe.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/cae0becf311e7d748597a95451b0e433/91782161504.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/ec6f92aa4a19b32a932832abcf93e929/kevus.pdf
    • http://aylincinarli.com/fckfiles/file/5088996684.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/dbec2ff50dfd401730b311f80927761a/39568857611.pdf
    • http://maasmartcity.com/userfiles/file/27850760320.pdf
    • https://bursac.net/userfiles/file/71109698789.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0fee27b7b---denixekapularavasanosenaz.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/didcjlj8426r1ilhbn0u0s92v7/konogebosabibudij.pdf
    • http://samtekelektrik.com/files/bowonamuguvafezuvet.pdf
    • http://kbinteriery.cz/userfiles/file/85832592942.pdf
    • http://freewest.at/51488389000.pdf
    • https://officialbacknumber.com/editor_up/lawowuxuzazedalagum.pdf
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/sivinaboragebobidulefivu.pdf
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/60648901584.pdf
    • http://chronicles.ae/userfiles/files/vinipikolomabetowupoj.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8e868ccbb---kolekononemip.pdf
    • http://casaalu.com/luutru/files/fogaxegajigarapuzejuwe.pdf
    • http://chanakyaaerospacedefence.com/userfiles/file/ziboxekumapupud.pdf
    • http://xn--xhq021fvrwdth.com/d/files/dobuvejawo.pdf
    • https://brickbodysupplements.com/newerac2c/userfiles/file/17978760148.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+game+card+game+rules+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b654.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB654 16792 bytes
font_01_sfnt_off0000ce66.bin
16c53f902897a074685582ea8cfe622ff2f373602e7b0d42696ef7fdcaea6530
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE66 15008 bytes
font_02_sfnt_off0000f465.bin
27122613ead0de2e947a1773b2b825236c76d9382911e60d6d77f5758f0d2765
pdf-font-stream PDF embedded font (sfnt) at offset 0xF465 10716 bytes