Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e3dc05345a150d…

MALICIOUS

PDF

68.7 KB Created: 2021-09-28 03:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f0cc6b703a1985d97b8a5cbeeca0678a SHA-1: e81ff9d590787076fb0095e52381325d4f8c1cff SHA-256: 40e3dc05345a150db128feb2b30d81319d6d7523ac6fd15bd5337262a570abd1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded links, a common tactic to deceive users. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://smidgel.ru/uplcv?utm_term=zombie+highway+unblocked', likely lead to a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 68 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=zombie+highway+unblocked PDF link annotation
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/94399931003.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/72268049986.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613521637ff08---pudinugeza.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/repor.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/4387570840.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/tuzepozurilalax.pdfIn PDF document text
    • http://banquat.com/userfiles/files/6776966282.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ddvqmftsg9jbkg80sdrhvpljso/95952428935.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/nowowikagumatevelugojotav.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161413b4491636---53330449891.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/3b71a0cc5c22f37f939e048f89d0c51a/97565152029.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/14957565788.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/85345080773.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/47504134870.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/80154554129.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161431af1780cf---dudotumifesugaf.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/68605301721.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210918140407.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/rosowowan.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/kusitif.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161449e9deba2c---fafazoso.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_off0000aec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC6 10944 bytes
SHA-256: d6b0cacbd8911651e73972ea8f5c6b8b3ba3a08311fd27284b3d698ad878a018
font_01_sfnt_off0000c7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDE 14372 bytes
SHA-256: f60c09113173d026e6d95198e5b7276293237466b83eaba42a06a3a1d42a4a21

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