Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43f4ccdfae799b5…

MALICIOUS

PDF

69.6 KB Created: 2021-09-30 22:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 67a2ef050e0c2327535c05d15d4dc22a SHA-1: 12ba6636464b7aeece234416e6c9810c8a085adc SHA-256: d43f4ccdfae799b5732358e8967141c0e02075fada2d965e98c823935dee19ca
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. The heuristics indicate it's designed to trick users into visiting external URLs, which are likely hosting malicious content or phishing pages. The presence of multiple links on compromised WordPress uploads and disposable hosting further supports this assessment.

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://smidgel.ru/uplcv?utm_term=she+will+be+loved+easy+chords PDF link annotation
    • http://giaphatmed.com/upload/file/woputin.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/35823463102.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/ritenavogidilesalamu.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/rubegetedaw.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613082ec9702d---86766580791.pdfIn PDF document text
    • https://biodez.lt/i/File/lunejaneputeros.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/piwiloledelidorizodupu.pdfIn PDF document text
    • http://htygroup.com/upload/files/21455806211.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/59376643193.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ndfgpuluuj50rjhc2t88lsvek3/nevazuvubijorudakeku.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/72090364812.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/88884657169.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/dupolen.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/darodulovala.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/gefisibitazirixiwuw.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/visiboloxejijoboxufusiluz.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/78088322636.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/rebenagifipotasogifukise.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/tiwivutewomepoxazexug.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/bizidan.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/36184561866.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/kotebuxud.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/kugidawefigogede.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a5f359433---kazegat.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/wezekinulelepatubuwo.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_off0000b3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A0 10744 bytes
SHA-256: 3967c4db227cf452c8a79f7ffc3869c70488198e20b26f1ee2b14aeec81b50e2
font_01_sfnt_off0000cc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC81 14396 bytes
SHA-256: c8893bfc1b97cdf5b80392e3034a730e31a3be47b814ade1cc6bcdcb721014b7
font_02_sfnt_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1