Malicious PDF — malware analysis report

Static analysis result for SHA-256 c494867263adc99e…

MALICIOUS

PDF

84.8 KB Created: 2021-07-01 10:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 25ca4214b1566615671bef97a57ed139 SHA-1: b746f4651b8caacd310216bafa5a75dc0d923aa5 SHA-256: c494867263adc99e630c46f593ef4e4a2ba71caabd0ab3309ce029a67e23ce88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristics strongly indicate a malicious intent to host or distribute further malware via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/ab3936a5e7eb61e8bb3200878d99a7c9/nulorufuzakanezezop.pdf In PDF document text
    • http://prestopc.it/upload/file/95290463253.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823b6e19d5b---68787064299.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9208e6c509---kevajuxiso.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160702cc2ded1f---zedapawubezaluzumiwufomip.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/32539d3a7a44530f8b6b0ea5702f0475.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/rezakuzigasedajexidinuneb.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608372ee90564---zajal.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/ucoik8no44gkhr2bfn4hi1nh1i/vobumupozumupibujup.pdfIn PDF document text
    • http://chinalabware.es/d/files/nulodu.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/39892432151.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/76d9cb0754269a867cf9491416ca0679/voloxililogakused.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077436b414f5---33976385767.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/69068697430.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/tusupofijawitowavo.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/4439bb958f8205bf2d7a0b04ef3f0929/ripejafazobikadejediwim.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/94039228805.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/32985777313.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/gilawofoma.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160890a8631360---siwalofomub.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/57424805877.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/metukozatelosuritokadumi.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/f5b94c5919d239ce08fa98584b45d964/xabafuvenezanawiponek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what+does+yellow+and+green+make+togetherPDF 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_off0000e8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F5 10888 bytes
SHA-256: e8d9a12608b692cea423f7d5ff3025d0b587256bbea8ed5273f9733bcd0b63ba
font_01_sfnt_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 16960 bytes
SHA-256: 77d4d7ce4d65244a75185247fc096b3bdc12f8f49562ef0f3da5a0e574ef93e1
font_02_sfnt_off00012db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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