Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d7541c920a0282d…

MALICIOUS

PDF

79.6 KB Created: 2021-08-29 01:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 689e9bf9496e0522b181d24959a3b77d SHA-1: b34c43c61f954d44f4a103e5bf2ec418bf485caf SHA-256: 4d7541c920a0282dab49df084f785bfa268f9590e7e49317b63485d3ca15636c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple unknown URLs supports this phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/sgr8beoau47bkl9ums6vi0eat9/tisexumufosotavarefof.pdf In PDF document text
    • http://bright-mineral.com/uploadfile/file/2021080504113626.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/fikupebafazazilikiwep.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/bapesituxelifonoper.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/zasozujenoduda.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd193d93be---86141506999.pdfIn PDF document text
    • https://mavibusiness.it/file/wiwifutene.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/mojejalemejo.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609455e8cedba---lozepavurikutabujiper.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/51711615076.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/gamakujivumu.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084da2263cb1---voxutufezawi.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c8e148f7b---12009543670.pdfIn PDF document text
    • https://iword.de/userfiles/file/91995579262.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16078661ac3be5---25370085388.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/zipatisipadejejoxi.pdfIn PDF document text
    • http://kokomo1986.com/clients/31029/File/miwiwe.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/49421487998.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/53310152037.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d40d499dcbe433fedf7b4d2596bbad92/wuduxilu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f43f5bcbc0f---59514769120.pdfIn PDF document text
    • https://chornakorn-packing.com/ckfinder/userfiles/files/52624574145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=946+ml+to+kgPDF 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_off0000d303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD303 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB15 18292 bytes
SHA-256: e086fe10c1c40eee327c0690e3a8b49b6267bb48d3cb7ea0012f7381a68b9f1f
font_02_sfnt_off000119d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D0 10100 bytes
SHA-256: bc066c85d60cd5cd1663d354aa359b698095567a6fe946932b69898ff8d7ac06

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