Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5b63d5f6c1db06…

MALICIOUS

PDF

85.6 KB Created: 2021-09-19 00:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b5109efe0d2ecc3c0bece340804cf9b5 SHA-1: 44b06baf22cc9fa2b83b65c1fb4da58e94f9ac94 SHA-256: 6f5b63d5f6c1db061c184a8dfe18592c6d4b3f7a46d32fc916f3ad106bcca9f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a tactic to host malicious content or redirect users. The presence of a link farm on disposable hosting further supports a malicious intent, likely to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423ff588513---pilimulabijizuxutufuxo.pdf In PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd242468bf---jujipasunosepagupone.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/suvagumazemiz.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1154cc148952d74976a98a9eb7172344/febigujakuwabotejufeseji.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fa7bc7450---59241479230.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210904_4066D0D2AC46427E.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/firuf.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614209af80382---demaruvopubu.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/71787690337.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/25492931208.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/53pt0iruchb8h62v4hvcpsene1/pufoketitugidezexalexej.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/sogapexuvukanezediz.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/nasujokagemukefenixenev.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/fupujisuvekijumolewajil.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/63092487662.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/70qgbnjal06asrui9eujrdu2vk/xozezib.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/fasin.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/sisiranojofabemuviveken.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/rivagebisenovemobekevo.pdfIn PDF document text
    • http://meta-min.com/files/4405794158.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/kimezujagikatuvivumuva.pdfIn PDF document text
    • http://pnalog.ru/images/file/romed.pdfIn PDF document text
    • http://all-premium.com/user_file/files/rewuditugisudimulapiv.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136ee1c5cbc3---56640657526.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/79317854693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+forever+purge+movies123PDF link annotation
    • 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_off0000e705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 18392 bytes
SHA-256: 13547f9e24e7f0602f38ecbc0eac4b58c6461459ca2e2ec33a279bc3816919cb
font_02_sfnt_off00012f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7F 10868 bytes
SHA-256: c0ced6a2bf409427810a8fef85fcfc152822f7994bb9f4d420f5cb2dd909bee8