Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85892504e986023…

MALICIOUS

PDF

85.3 KB Created: 2021-08-12 13:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 87d6e3ce2b8358895509d3b5140cc019 SHA-1: a05350384d3302a23e4e13ef053340554f8b3f7c SHA-256: c85892504e9860235481575f9ec164a44849b753f4fe02ddb0116cb7e7c12492
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious and exhibits characteristics of a phishing lure. It contains multiple links to external PDF files, some hosted on compromised WordPress sites, suggesting a link farm or redirection mechanism. The critical heuristics indicate it's designed to solicit recovery secrets or passwords, and it also mentions password-protected archives, a common tactic to bypass gateway scanning. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://silverwayshipping.com/userfiles/file/lipubikirenijorisaxe.pdf In PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab205153400---50567293671.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/13391856190.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d13b8d302c---9687280730.pdfIn PDF document text
    • http://kidneytexas.org/clients/861060/File/67034694694.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/dufuferubuvugafolujoz.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/pidilerof.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/fedila.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/esjt6t329n2isetev073ncv257/20144198484.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/b1f66a99815d7a60773e047ee812d95d/modevatopiwate.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/fb5aae05d6786cc9177f1c48b9954a39/23278144065.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/52789731870.pdfIn PDF document text
    • http://www.moyekolodin.com/files/kajejuwuwawelonomefotedik.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1984cce8---lojakukixupurufemilosefok.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e7ae2e9d9bf---xojozamujirebu.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/fikubus.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms//images/file/68375262007.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a898838da76---forez.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/n3462b8tr6ajahg6u6po7e9rr1/13962366996.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/43954024864.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/kujazisowuw.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e14854eaa9a936c40db6c08d09122417/zesivegotusukifa.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/24369101475.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/313177aa8503c9bd0ef8bb346c53a21c/babevivazajikemusox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+find+stored+passwords+on+androidPDF 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_off0000eb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3E 16820 bytes
SHA-256: 33cd1839476df1c9e5c8df0509ee0bdfb0e75c0627e99b1033c91170d374ef10
font_01_sfnt_off0001173b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F52 10520 bytes
SHA-256: 6790e03b8a086843b476a7272b5d896b2796f1036b7cb4449e1f620b6acb262b

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