Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66b0d8beb82f2e7…

MALICIOUS

PDF

78.2 KB Created: 2021-09-06 13:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00bd022d44223775ad04b8abe545e730 SHA-1: d1f67de007b965a088d5e6389cf116d8cd9b7d2e SHA-256: d66b0d8beb82f2e7548568b1818dd5de520a75bf8e1aaefda63bedb183ba9fb2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a link farm pointing to various compromised websites, likely intended to trick users into downloading a password-protected archive. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly suggests the document's purpose is to facilitate the delivery of a secondary payload disguised as an archive requiring a password.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://nomylo.ru/uplcv?utm_term=bcas+fleet+manual
    • http://nepodoshlo.kz/ckfinder/userfiles/files/xigaxol.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d993fb60bc1b8c3fd737bd21c2042b2f/xafopifodalagogomo.pdf
    • https://gyandeepjkss.org/userfiles/file/37731195923.pdf
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/51941739775.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608873020e02f---30483063221.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a1a101a0165f6e5b4c4c850443f1cdce/97996465821.pdf
    • http://veterina-hrib.cz/user-uploads/files/soruvureperipidimasoj.pdf
    • https://mingyi-lock.com/data/file/userfiles/files/mabowukesowile.pdf
    • http://candemdientu.com/Images_upload/files/35401279288.pdf
    • http://pizzeriagiganti.ro/imagini_ws/18676613339.pdf
    • http://inruho.ru/ckfinder/userfiles/files/52946655149.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611712a1f2255---nurafiwedosuroxisotufo.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16111377f4c4be---66247973373.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ba125853381b70f2e1a48eae5943f408/91741381771.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/n94fg1vt40l7v5a0foma3jq593/jafoj.pdf
    • http://jandenzobv.com/image_uploads/file/zubulimigiwuwetidalejag.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b52c24f356f---jonid.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/bjmsok7j0hmespp2lbqcld7ctb/jejewedewofe.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/92f35235d23e10d9797da7305ccecf14/96203339978.pdf
    • https://ascii.tn/web/cgi/file/fugotu.pdf
    • https://maxflowfans.com/userfiles/file/83796401222.pdf
    • http://immobilieninvestors.de/userfiles/file/91298176674.pdf
    • http://sh-ruiyangcpa.com/userfiles/file/2021-8///20218311518251289.pdf
    • http://scoutpate.com/userfiles/file/58725722174.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_off0000ceb6.bin
ccf785c394d5327ecd29480ed333da51ac66b0c68961db37fd54116f2dcce85d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB6 17428 bytes
font_01_sfnt_off0000fc2f.bin
d3d1c4da0914b6465ed9bc4b80de0296a1386e18ac1accb10edf0c7dc58a21eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2F 10336 bytes
font_02_sfnt_off00011390.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11390 16792 bytes