Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9bfd6cdc75a79a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 04:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 35fd3b5aad1a0628436efc6e1a5aa73d SHA-1: d2c7e52ead8b4da3f1e10d16975698d232650ec4 SHA-256: 7b9bfd6cdc75a79a593e2ccb5cf221d9ff6168d8d9d0eda36400012d87f3322d
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/319a73ac95d3b34c725eb64db6a97bc7/25625769885.pdf In PDF document text
    • http://myarrahnu.com/mo_images/files/kuzubusow.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/e7e9db5d4c8d1a94990934fe04c0e294/28179073786.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/38709607521.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/172e1373500b62e4ffa9e2b713003771/lilunigozijojeg.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/70538299004.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/6302cb1292f8bb54bbed11ea039a97c5/gupurev.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/veturerowowilum.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/buvibezufikuzawobuzutap.pdfIn PDF document text
    • https://whitesal.com/data/images/file/3973_20210628194551.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/85995969612.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/aaf579d1656c73a7548610c6bbbf2264/mifulixupiborax.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210802204905.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210811234219.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/2007315283.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/wijegotekagosevafawedorix.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/wugorivamezofo.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/55483649652.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/99f6653ceba3afd22c61b04a5bb6798f/26548008625.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/foponojem.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/kd1kjeco6h0q8c6nn9b5hk800l/1118923001.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e46974763---nukuj.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/bagugubiwerepeme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=2015+mustang+ecoboost+manual+vs+automaticPDF 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_off0000d267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD267 17936 bytes
SHA-256: 5c9dccac4c2786c7f67d41d0569308cf3fd4acd2646938a52b9606df355f7d8d
font_01_sfnt_off00010138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 11112 bytes
SHA-256: d2588b12cc95f779ebaf53d6599125b4ab9a3ad8b51e9a0cc61a42d03e549996
font_02_sfnt_off00011b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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