Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad11a0c0bd1cf46…

MALICIOUS

PDF

77.7 KB Created: 2021-09-17 12:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 48be134edbf4cde07b43e02ed887eb71 SHA-1: 79de5901d0d4aa1fa2c744c00a0e099ac1c02393 SHA-256: 3ad11a0c0bd1cf46fc80c64af91beaae4d86422216b6ef7a3edc826563e1b9cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a URL with 'utm_term=x+vpn+apk+premium' indicates a potential lure for users seeking software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://queure.ru/uplcv?utm_term=x+vpn+apk+premium PDF link annotation
    • https://jairdefreitas.com/ckfinder/userfiles/files/bivojelizofupe.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161356e3c6f6bd---gememerufes.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614009770d12b---zekowikisuxezetux.pdfIn PDF document text
    • http://christopherdallo.com/file/gosotenegapar.pdfIn PDF document text
    • https://samowar.ch/upload/file/bavisuvidox.pdfIn PDF document text
    • https://conrays.ru/f/data/79164569376.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/82330647903.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/47580925052.pdfIn PDF document text
    • http://myesen.life/userfiles/file/82720975217.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9e5b63e1f---30338998710.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/pasemanamim.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/60114349307.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/94b73aa824640e24c93ddedff7fd30f4/38951784933.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631704504.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/96290163242.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/jinatola.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/lezuvodoruzola.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/22674805188.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/zebogalomuzizofoxuwowu.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/jolidupadanu.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/boregiforilen.pdfIn PDF document text
    • https://brs.jo/userfiles/files/juropikubili.pdfIn PDF document text
    • https://fuoriscena.eu/file/vamud.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/pezavup.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/3412386480.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/zuwiwokasuxum.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_off0000cd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7C 17348 bytes
SHA-256: b93825a04aa8d87f4fc10f343f27e62f0c268a1dbf85d097f1e00c06729aa9d2
font_01_sfnt_off0000faa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 10244 bytes
SHA-256: f20ff2daa2f625621b2f3b738cc8f87e16dd5ae1175b73cae61feb030794542f
font_02_sfnt_off00011193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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