Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca94ec20a7f2809a…

MALICIOUS

PDF

75.9 KB Created: 2021-09-01 17:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5ec373e438d49c6b78958b3baae1fbb SHA-1: 0e05f834e8bb858feef094a5abf7b13c4d1fcf68 SHA-256: ca94ec20a7f2809a010b195aa65f7b0afb3c878619f3419658a1f9edd7109f72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://huntic.ru/uplcv?utm_term=bully+scholarship+edition+english+1+answers
    • http://texmet.pl/userimages/file/72791257417.pdf
    • https://rajakedua.com/contents/files/47463115935.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e7809125e16---buretoxexodakupa.pdf
    • http://mnogonomerov.ru/uploads/file/2101939680.pdf
    • https://safehouseservices.in/fckfiles/file/rotawagovenefinumuzigid.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b849b019bb4---87848305661.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fbfa51891---xobobipitabapevarag.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a846ae4d07---lesaleto.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612e786169407---rifanirexo.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/8a2adda8f4832959b63412c670e82d39/jixupolumajamozakexaw.pdf
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77262248165.pdf
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/62394492566.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb5ae85969---wamomituxid.pdf
    • https://newoptic.mn/uploads/files/bavatajatuv.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6685c9a4b3---pulizewusuwawazanawa.pdf
    • http://geose.ru/userfiles/file/17861865887.pdf
    • https://wotfiles.com/ckfinder/userfiles/files/70236143007.pdf
    • http://kubkao-kubpla.com/userfiles/files/jolutatep.pdf
    • https://andana.us/files/files/taremumukonavaboluposav.pdf
    • http://phuongninhphat.com/uploads/userfiles/file/tafulozolepolokap.pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/01dcf7e0a9e254fbe46a98cd3401ba31/tosijasom.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_off0000be03.bin
f9d83a65d30c88529cf97b7fcca2b52a0e8a64da1744af52045d79b7675b9aa8
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE03 11196 bytes
font_01_sfnt_off0000d828.bin
db82a90e945463d043bfb1f5e24bc19045e8a6f48ba1adeca370280c1a7a7e17
pdf-font-stream PDF embedded font (sfnt) at offset 0xD828 18216 bytes
font_02_sfnt_off0001067d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 16792 bytes