Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd31a9ca99063d5…

MALICIOUS

PDF

84.5 KB Created: 2021-07-17 09:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e2a254d1f93f4d7bcf04ec84eb466232 SHA-1: cab86d98f85b44ede25602a5680a3fda768d5cea SHA-256: 4dd31a9ca99063d511c81d9fb02df996b28557b4f3dda94120445a2b79870967
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document's structure and embedded links strongly indicate an attempt to lure victims to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://windsbs.biz/files/file/vadererafa.pdf In PDF document text
    • http://contelex.it/userfiles/files/sefajexi.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/hag3heelbr2ip6h2cupen2rn75/jusitor.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/levinojavaweletawedamozin.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/kavegutikujovasapixevu.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b89817b8a---60954116106.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/73075405598.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/757b6a1476539bf7989d79ebe6d14813/wozenunibelarufuba.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d5358a910---siwogunisifefeniba.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/wijozunajobetedapivebaken.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/c91da63e55d212ed254a1e62eb84b218/95257486311.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/v7bn13qtdm0q4aksv7e9r9fnr9/81439590122.pdfIn PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/bakole.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/75365356253.pdfIn PDF document text
    • http://guitarenko.fr/img/files/gexepapogizobagigove.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/a12eb9e68d7931a4844033bb2a77049c/parix.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/xifafogokugirimeluji.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/a5fe4nfs91bg36vhnbhcjhn3ui/54053673041.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/e58b4ac259061f5f17d3c65912aec04a/jaxajibuda.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/cj4l9u5ol4gr4pdljlqh7upr87/zirufavawukovolopules.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=house+of+cards+s06e01PDF link annotation
    • 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_off0000e5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E3 18336 bytes
SHA-256: 5da4f1f18e9d3fdc204e34c931ffba5f87e08efe99eca4003bba13e7dd965213
font_01_sfnt_off00011520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11520 10560 bytes
SHA-256: ee767ebabf9333d191e3f7fa7f45eb05807adba8c2152ff1b5ab7ea84909cdbd
font_02_sfnt_off00012d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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