Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f013bb92eab6bf…

MALICIOUS

PDF

85.7 KB Created: 2021-07-14 03:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a1725a4234f12d204c2989bd0b64363 SHA-1: 3219b7b1a4a562d371a0fb177e0349bc15b6b3d6 SHA-256: d3f013bb92eab6bfa07b340ba78cdbf436f1ea7a0af1e517864119cdf4e088f7
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites. These sites likely host further malicious content or phishing pages, serving as a distribution point for malware or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aaffbbe9686---kemeledowividap.pdf In PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7ef9c0e68---58667972309.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/afecc96471a438a3c18060bb13ba8cf7/nofugifore.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/a5bc393fc9c96d1258b8fe061018abdc/xunowoz.pdfIn PDF document text
    • https://davaocarrental.com/images/file/86821696115.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/ebf86ca45fe23d3d98c3d5c896d42886/44014796964.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/78505945658.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/gvfh2a5d7rof9enk9qc4adf7d1/41631168987.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b007d5d372---pasegagenivurudon.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/77109219801.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/18092696004.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/u6ql92bjusg130agv6kquu3pk0/50730301230.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609865ba63a2e---jamegomutedupebujaj.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5033c903e---pamaxegukevidibaginuxige.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/89a08c90dc9d76e9798268613591fc2b/josamulurenariw.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/25417cecb41360e57f12d82ceca11c55/2610788182.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/17492850745.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/mpaf1hm6a5c7s2kjklh1dfqnr0/lipetefo.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/54588281760.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088fd8051e78---194196745.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/gemux.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/31523625347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=breaking+your+intermittent+fastPDF 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_off0000ed7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10593 10868 bytes
SHA-256: c06911b68ae0d27f2d64a0056601eb0a60cbfaf1c39eb02c1fb180834be2a54f
font_02_sfnt_off00011ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC4 16680 bytes
SHA-256: 03504bd0485539f77088fcb15ead118bb4c7fe7faf58d2fc4b8cfda776627d3e

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