Malicious PDF — malware analysis report

Static analysis result for SHA-256 77806fde0604a39c…

MALICIOUS

PDF

77.8 KB Created: 2021-09-19 09:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 167d8c19adca41c7946ef779b48d5bfa SHA-1: 6e188447f1aae26d969ba7f3af90551ea9b62657 SHA-256: 77806fde0604a39c1abcf07e398183e1ecfd196b535553661005d4413c91d75d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=old+text+messages+reappearing+android PDF link annotation
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a6456e2fc---dopanukuf.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/jumosibafukajisow.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/59662c0440004d139c9b1a052fa343d4/mawazoxexujam.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/6260624354.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6e056f901---subomugipuges.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/65307157797.pdfIn PDF document text
    • http://come2menorca.com/images/file/44739900103.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/34653940866.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/sujemafoxaxe.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/putopilolaja.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/99169033220.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/zawisufafesale.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410977a3552---mijadit.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/podegunulapunegegavugubo.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/juwipari.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/42353467461.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210919111255_858776221.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/fikopaxesuxuborugiga.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/depujara.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/32425607193.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/muwifobepeba.pdfIn PDF document text
    • http://samtekelektrik.com/files/buzufijeg.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/wapozagagotanarobavafux.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/zawekegubaberuzavitopi.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_off0000cab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB6 17788 bytes
SHA-256: d9cc36f652e123689317718e4446597e0468d1e0b753645d403a56e31a42c511
font_01_sfnt_off0000f832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF832 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11049 10860 bytes
SHA-256: d58443a6c6778ebb181d97a8a9103b3c8a683798c2acd857d7e94094eff347de

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