Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a36394c51f76f8…

MALICIOUS

PDF

87.5 KB Created: 2021-09-06 14:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cfae561e58a45c692b486665bceb213e SHA-1: 7d130c9d03428aedfcacc084556d873103480c32 SHA-256: f8a36394c51f76f809933dec2f8a9c0ca1866a8fafac785e025080798e771ec8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains numerous links, many pointing to domains associated with link farms or potentially compromised websites, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the nature of the heuristics indicate it's likely part of a phishing campaign, possibly using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://khyljg.com/uploadfiles/files/xuvademoge.pdf In PDF document text
    • http://ciskmv.com/css/file/17609647248.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611af60b85755---68459268999.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/biroxejokuf.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/64634156985.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/valomesokorogivisas.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/jakajigod.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/33547700338.pdfIn PDF document text
    • http://shesob.com/file/files/sokonu.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/78e384b77ef61daeb1649758beb78b24/gefopegigalunexiritu.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/wejikinidefagodekanedanes.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/gamuvodilebegunal.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/jinexivoduxopibelimojesug.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/95856129547.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210815114908.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/v5aacu3l8nvr98io5ggq01920e/45037396900.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/lksivrana0pkef9qv0plv1e3b3/5059331167.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/46337783841.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/474b173060926ba0188bebc7d7827bd9/junituzurojota.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/pixufenaxotesorerodu.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/96901750805.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/77826085520.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/95730544830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=toyota+auris+2007+user+manual+pdfPDF 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_off0000efd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107ED 11128 bytes
SHA-256: 5ccb63306da1e432c33ed3bf262bdeb7ddd624e02e47c0613650a7dffc841cca
font_02_sfnt_off000121fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FB 18124 bytes
SHA-256: 6d7063d6991bcef012ae1577e20834702d8a91e424f969f0759b91cf9dcd54a8

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