Malicious PDF — malware analysis report

Static analysis result for SHA-256 a322d202e5f3cb5b…

MALICIOUS

PDF

74.7 KB Created: 2021-09-13 05:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0d726d7d1532aee36a7d315e103f4dcb SHA-1: 28613b33cb974642f57a7eccc5c3baf5daec01da SHA-256: a322d202e5f3cb5b6da743911f2025dcfa8bd18ca6bdc82e354e9c156c1f5b30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting sites. These links likely lead to further malicious content or phishing pages, indicating a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=offensive+words+that+start+with+l PDF link annotation
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161369fd57a492---69121843177.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/81548142828.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7e5519197---61692084972.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/mewofobatizopafuvokurekap.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613066522e7ee---26615913494.pdfIn PDF document text
    • http://esejsc.com/upload/files/lidokugarevetazir.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/83386226178.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/matanafe.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/98314412866.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/95983597688.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/faa193dcbc89ca1f7bf1a7e03e6a9d9a/gajerukelatakosapabureb.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e97aa57661---67534716184.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/madezimunavewapegubol.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/7367029343.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/l11vpicba742nc4aspchmv19c7/zipolixigaxudenajazagure.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/ribazurizuwiselotigod.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/49311984727.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/7076512616.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/xofopesif.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/21313003313.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/39117503757.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dacb28213---zaxubanites.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/64135140695.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/84217205041.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_off0000c08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08A 10628 bytes
SHA-256: 60fc38dc2a1c3832ba4401c40ad1504eab7fa124dd0be609d5e6d57f27ccf127
font_01_sfnt_off0000d8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F7 17352 bytes
SHA-256: c02cd624e2c645148ead9028c386b93278c201f28f244202f8f574e78cb1c833

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