Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d097f0cb644a38…

MALICIOUS

PDF

92.8 KB Created: 2021-09-01 10:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 95b365f96e976f3bef46f9afb336569e SHA-1: c5aa3560eacdb675de0292a3e2ec6fc6b268b7f6 SHA-256: 05d097f0cb644a38a7ed56911ecdce2deadfa0c7cdae7a53146d4d1b79fdab55
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of numerous external URIs and the compromised CMS upload link farm heuristic suggest the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://nwatchonline.info/userfiles/file/riverukukigakal.pdf In PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/75406772018.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/8d3914695a0949772a06d3895f4a35b4/65196313033.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/13934604681.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/8mshmmlgqkbu99c8vk7oh1n114/xomisonarubebu.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/92929586369.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/limawigujirilivetawosuje.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2d542d0acdbeecff754ded8fd4b12ff1/zejumisalofi.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/77980221840.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/1e661cda47573b52e2e88108ef8866c6/zigopubenuzakomu.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/8ddbe3f81dc6d092194c43265b599ad1/81819264618.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/6646522076.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/e70ivt08g8qvuj3fu7h3hjb1pj/92582566896.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/kisoruwi.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/20386172830.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/92475675368.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/5242166177.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/dokevuf.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/a2e14c74dda76b15be11df32730ab695/duvixagaxajurerofevepun.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/84ba81244d0ae6d323d1d788c05d31ce/nafusekoxilego.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/2334196619.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d1hfr6rhbb2ve3han7qngfa1n5/retemo.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/a3e224ff1beb3a0e61c60f3c19cc3ddd/lidawerodugu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16095ba09ca31e---93634439578.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/82329379281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=bde+meaning+armyPDF 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_off000108f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F1 17584 bytes
SHA-256: ff411c49f9205519636781031b111fe8eebb8ade72365795b87aec345b96cf88
font_01_sfnt_off000135c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C4 10328 bytes
SHA-256: 3bd45916a626402481b912e61d1d59f6fa3443622625a5ab2a75166a75f1e144
font_02_sfnt_off00014cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1