Malicious PDF — malware analysis report

Static analysis result for SHA-256 7186c14c78da21e7…

MALICIOUS

PDF

70.5 KB Created: 2021-10-01 18:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4f09a0e0951628bda025f31307f76d50 SHA-1: be3d83ef132ec1e86cfd621999277a27bfb983d5 SHA-256: 7186c14c78da21e75f9ad9999b5498975be85e57201d551775465c59b395fd43
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The embedded JavaScript stream, combined with the ML classifier and ClamAV detection, strongly suggests malicious intent. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, rather than user-facing text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://laborke.ru/uplcv?utm_term=vertical+drop+beystadium+qr+code PDF link annotation
    • https://wanna-drive.nl/files/File/wawogewivetusotoxiva.pdfIn PDF document text
    • http://rococosofa.com/files/files/godiwedigub.pdfIn PDF document text
    • http://cocoal.com/uploads/file/80147544145.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/pufuzowubijalemiwasefi.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/juponakit.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/96351662855.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/35823990366.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/85864773119.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/bikafodupozim.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/wuboxelopemesonuposuku.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366d8ea19c7---pulikisanuxuva.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614313fa42475---5340159454.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/78603523830.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/reten.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/hvrpq8gj6r4odrh1garoti42fm/jafezevibuxusosirotijezi.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/99222894130.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/musolifivakibemexedonalu.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/55812368652.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/98830774693.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/14901427905.pdfIn PDF document text
    • http://jadeite.ru/images/file/mibalugodiso.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/65857225065.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/xovojamofonowegawapori.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f6c98e429---wejetobulujefoxikakaj.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_off0000b33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB55 11040 bytes
SHA-256: a4018acdd834175bcedd8bdfaf33cde35f1c42d27533ecf58e0e37a4de1e6ddf
font_02_sfnt_off0000e4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A1 15680 bytes
SHA-256: b0dd4d665d73689d5887dbbc1cd8a1896630424470d99408a654346a3f92e537

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