Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1892a87a4cca75f…

MALICIOUS

PDF

67.8 KB Created: 2021-06-28 17:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d764a85087137a5e8ee97ac3f1ca4393 SHA-1: 706dfa6111bb030e577e6d3808a5783ae8ce5348 SHA-256: e1892a87a4cca75f95da0216a1d6f0f1cb39c1bd39ed6434aa101e1ea5167d1e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV also detecting it as a phishing trojan. The PDF employs a screenshot lure, typical of phishing campaigns, and contains numerous links pointing to potentially compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. While no scripts were directly extracted, the presence of external links indicates a likely download or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/dr7iugdggu7ml3ib0icsvpr810/ruxuvatawafaweparutati.pdf In PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/lorozobil.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/tipusipaku.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/lesemutukupopivefaziki.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/najavenekawosedezowexet.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16099a2f03644d---vurusoparomolab.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/41abc38bbb4406d4ffacc63352046cbd/8860724988.pdfIn PDF document text
    • https://ksboutlet.com/file/files/88904199777.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089b3096cebe---dawovelitesikowogejiguki.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ee87d4b1e---mivagofujaxalokizebekose.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a1adbcbf00a---bedupukopi.pdfIn PDF document text
    • http://sukhabalka.com/files/file/zarabotuvitemufezo.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/mesujovemofijetijabiliwa.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f76921ceae0108929fd0bb3f3218f94f/jedoxegigej.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/85611f375c4f3ad5605cad7a9b5066bc/daxepumus.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/70305818945.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/kv5bavre7hb9t8du0miduug0m2/romevenekufaxexer.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cbea01912---31842419069.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/tupexesimanodugigo.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/28477184789.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8a7a96b2ffc9a886c5413f03a96353e3/zofidikabi.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/xadavamirojewuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=late+onset+neonatal+sepsisPDF 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_off0000b058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB058 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86F 10104 bytes
SHA-256: e0e38df73c2fa38aa578223c0af6d634c03dae8ee75a3cc65c6cd9937f9c5003
font_02_sfnt_off0000df14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF14 13976 bytes
SHA-256: 205389a5007b5f1604c9e8fa3dd5f118930da51120b164f3ce2db79e63a1d545

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