Malicious PDF — malware analysis report

Static analysis result for SHA-256 57383f4b478e391e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 21:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 489aa69ee322d7255a79053b358a6cb8 SHA-1: c38b7cd0b6f58f4ea95104e6c5e70cf4c09dbe7f SHA-256: 57383f4b478e391e3494f5125781f42aed99d336474add8a9f10f9ffbbc6e6e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://emenu.hu/editor_up/32494395428.pdf In PDF document text
    • http://studiolauramoschini.it/userfiles/files/jaxesopeketiromofiwo.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021072219380449.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ptkhicv3j8fh7or8nt55a11sas/94848766450.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965996f20d7---12388779160.pdfIn PDF document text
    • https://flying-vikings.net/UserFiles/file/nubosagajumofew.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/delonakibimibaget.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/95866111844.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/fikunumolovirewon.pdfIn PDF document text
    • http://0930actress.com/files/files/99092566479.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/67978197699.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/vinuge.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gisoluvaduzutik.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/werisukozatidutola.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd50509958---46337557609.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/dariwenizipabodurajil.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/l5bfn52mglbkk59ah0cofh2ckg/92598720971.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/ludaserejafo.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/79884298046.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/5npkgius7b3cdmaggqatsb8d67/jonibuvusadesilikuxenate.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/bajelofojubotefefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=body+language+tips+for+interview+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_off0000dcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C4 11092 bytes
SHA-256: 88b650e0f4392e7ebd16cff33a8853c05448cabc80f036b5ed68abe8eba2b5a9
font_02_sfnt_off00010ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA8 18992 bytes
SHA-256: 0e5c9fdcf9c28246da1c423ee8e37c48020e103b17df588ec524956418266b52