Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff6748c0d794945…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 11:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 99e42700354dbe77fe41c5244dfe708e SHA-1: 18b438f8875cefc1b71fac28ab4994a6ac732b1e SHA-256: 0ff6748c0d7949455a4475f185fcb225249566a91fb897582343f586c550b943
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various external URLs, some hosted on compromised CMS uploads. The presence of numerous URLs, including those with 'utm_term' parameters suggesting tracking, points towards a phishing or scam campaign designed to trick users into downloading further malicious content or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=download+game+naruto+senki+mod+mobile+legend+full+character PDF link annotation
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/32044309448.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d7cd1796e---52931844114.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109080849444166.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/rasazugazuzegekeg.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/84960035101.pdfIn PDF document text
    • http://gulfapex.com/uploads/file/petalav.pdfIn PDF document text
    • http://unibox.lv/files/text/bupipozoru.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109051744376844.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bc0a4bef5---kofimekoji.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/97051382751.pdfIn PDF document text
    • http://dsraxys.com/uploads/zodimonevurez.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/52144514885.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/nutuzenususepidisavo.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/joxezopalovuwimizejulem.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/zaduge.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/zideritunavolozotov.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138fe5fd8d2d---garebovanusuzuru.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/63897458517.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/16184252514.pdfIn PDF document text
    • https://mkontroll.hu/File/60467246521.pdfIn PDF document text
    • https://digireg.com/upload/20291081487.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/43824907035.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/92223141620.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/wipizunipew.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_off0000ded0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E2 17872 bytes
SHA-256: f1924d214ae565a017ef6e0207264b155c310231ef4790aa85c8553d733a6ab7
font_02_sfnt_off000125d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D3 11344 bytes
SHA-256: 3eabe3e4bb86891bdbb8c6cf34881b94b5d9f9ffc7a7a7e86a4effc597f57f71

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