Malicious PDF — malware analysis report

Static analysis result for SHA-256 b60b220fc610fffa…

MALICIOUS

PDF

78.0 KB Created: 2021-09-05 04:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7011170d767d995140d54117042074de SHA-1: 575b0b9e9f8b2419d8badcba59641dcc7e96e59f SHA-256: b60b220fc610fffa173ea86d5d904ecb17bc2514b3c8b79c0064a6a09532da87
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external URIs pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://laborke.ru/uplcv?utm_term=thermal+stress+and+strain+pdf PDF link annotation
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/5e4ebad2eede8e93d183c5e68495a947/gewuviviwivosumuxotosojaf.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160849ee46d75e---xubinogi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/urr14loglahpmrnjaea8ms34bv/vawifasufavaketerozaxed.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160980533d3672---vapadixid.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/xalukinufazugari.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6aac1fb14709f2a164445241aba615d4/fupitubibibozikez.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/79639853965.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/xinovulezidujazori.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b7605fd71493cd8575b5924284d4f0e9/97091617526.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/lezuvuweragefa.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/21744083423.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/84560151480.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097df0b14c35---tiwalogiteboj.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pl5e8qtbgqgno7b4dns99jqae7/ruzinugitasugozonotawovel.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/71f74d2f551a18169699d71a8f8f6e68/gozametemevu.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/laroduxubav.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b2de192cac8---34021784949.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8611a58eb---29582504303.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/dobisoriratinovetoweti.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607a3f3a0bf63---64477456886.pdfIn PDF document text
    • http://ubest.ru/images/file/vedemajoxeraz.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/53657330143.pdfIn PDF document text
    • 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_off0000cd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52D 10608 bytes
SHA-256: 4f29468510bbce561b3954975a8e03b1cfd200e0adb885b285135ad89efc0c58
font_02_sfnt_off0000fd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2A 17544 bytes
SHA-256: b91b63093c27e0176c00a6e46e1bb39612398c9f63caeae5d8d8570ed0985a86

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