Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f05dff2fbdb525…

MALICIOUS

PDF

79.1 KB Created: 2021-09-06 08:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a7641e0e70645bc1076ae7c5907be0a SHA-1: a40bbb8ae83977ff6b06207e584c871e9adb3632 SHA-256: b0f05dff2fbdb52576cc9b2fc6244aa149badefd0aa51c430c20bf652fd0fd1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or are part of link farms on disposable hosting. These elements suggest the PDF is designed to redirect users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=sociologia+libri+pdf PDF link annotation
    • https://tp-pos.com/uploads/image/files/disow.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/kufedal.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/63605855112.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a022d350d34---15899942782.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/nowozemaxuvatujexab.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/cdd3fefc16f8b672737b0682729bf6f1/rowajo.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/qos3j3o4h6610ahcakaq4rr0p5/jenasetuponepomot.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/zasabojoruwodurilezozo.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/33326429750.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/c7c6e0db0af2d5fa864e5af9f9663625/3086442609.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/70415451942.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/86427284353.pdfIn PDF document text
    • https://luminex.pl/upload/file/gujalametemaxujuzuwizumun.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/27544754204.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/16153652426.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d76f31a82db---goniwa.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/difitugexelisogowuf.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160afbef736e4a---wubaropitolugiwolidoki.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/71503626623.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd3b4226a2---jajowefubebuparigu.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/3846688861.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/dusutobuvodub.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/najiliwixezoruti.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/padobepunijapifavolaja.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_off0000d197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD197 17556 bytes
SHA-256: 977812f07f2cbc9d40442fe8c58b1b49449d67aaf8b79ef14b338b43190fb8e2
font_01_sfnt_off0000ff5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5B 10508 bytes
SHA-256: a194615146f8cb6770c716d5cc0e54a42901e7c4976e84a8980c05f9320814ea
font_02_sfnt_off000116ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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