Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3aed383d6466345…

MALICIOUS

PDF

84.7 KB Created: 2021-09-05 20:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a4088527706dd588c315316cfe0130c7 SHA-1: 1f37024d2bfc3579bcaf350daed21cfd5355ab34 SHA-256: a3aed383d646634538ccfebbb28127ded064610d6f59eb49ebe8ba52ef0ce2e3
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to multiple external URLs, some of which host further PDF documents. This suggests a multi-stage attack, likely initiated via spearphishing, where the initial PDF serves to redirect victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://flexi-cms.com/uploads/file/11984221690.pdf In PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/90684041122.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/a60da2f4fe1f527cd3d61d62b40bf23a/wojumamejofogalato.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/37033659391.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/fanorugezatoxido.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/98792432217.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/32627319346.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/de363ed5b9e2bf69a537631f90b3d00b/lasoxijowapojorito.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/p872nmeti7hm0ooc23i19hecg7/jolid.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/bepojowosajorojibodisoral.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/11636910250.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/titam.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6e148db0becbe3d8f6dd939973f099df/49450193853.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16120ea150a02c---dawaburiluri.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/zumexirawibotop.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/1b5d34408e6138ba673a75c5463477f2/bamijab.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/lq2g6c2kr92toekl5pfbnrpt91/46095206293.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/robiwudadinepefeg.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/acdbdb74fae4eda3017965767d28fb3d/16561157169.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/pozusosesa.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/41872976489.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/31e214ab51cf0e5e3b991c6ece7420bc/nivejatez.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fc4fe2327---gofawakeke.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a9c784dac---12497956677.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff84a4e753---63800533113.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/jedinegaz.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/381edaa93dcf822de9cae204dd72d2f3/20170060068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pdf+reader+for+iphone+xs+maxPDF 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_off0000e4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 10724 bytes
SHA-256: 913db6d4cbabb63b67cab2439a81b9fde1707f1ccac28033a0d87c5e69e5c1ec
font_01_sfnt_off0000fd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 17992 bytes
SHA-256: 6dc7ffac16a318ec68b6b270244b72d43a7b203543286d540cb2a0a52ae9ea2e
font_02_sfnt_off00012b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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