Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2a186cd3b69454…

MALICIOUS

PDF

70.3 KB Created: 2021-10-03 11:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7a4063ead3a33e81232c89a61fcde92f SHA-1: 0575805fdfb6957971ecbe67180d3b28cf05c89c SHA-256: 7f2a186cd3b69454f0039a86fb08a8e8731c5b8ddf011a4caa8e441ead30c440
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple external links points to an initial access vector via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=over+mixing+batter PDF link annotation
    • https://aljazeerahpetroleum.ae/userfiles/files/19033459379.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/bevovejusasigagapowet.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/wedapadutejeg.pdfIn PDF document text
    • http://specimport.by/files/files/bukegufanebedefe.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/96375775812.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/7896376865.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161540b7697a26---kubatiwenelaxobanedak.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/5976f077ce724db08c481fc4a26a6b99/69954822510.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/39604366161.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/61575459152.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/85993630248.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/91799048707.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/53158119556.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/1e798bda5876d808c4cc6a630e32a43e/gowoburaxafojekikegopi.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/32873619283.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c88b36a39f---82165702181.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/34472459120.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/demumutotulomo.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/54985082427.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/73674239989.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/miberoravo.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613864e934d92---vejazagegivet.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/57313383564.pdfIn PDF document text
    • https://ip-pharma.net/data/files/dexogulozedezurojixiza.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/75202416720.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0c21e39a2---refetozodesudetukuvoritep.pdfIn PDF document text
    • 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_off0000b542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB542 10452 bytes
SHA-256: 6cde3fccfbeaff964a6ccd352415ad92fb5a09a53635bf594f0b1bbd36c98282
font_01_sfnt_off0000cd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE528 14976 bytes
SHA-256: 8b0326c8a707d9ebadc2e213124a6d4f116c872f3f9ac61fd54e01ca8736f584

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