Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd55b3317b0565ec…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 05:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fcb11e120b78c1f8f23134691e4efbee SHA-1: 60f7cbc751841523983a85db9023f83618d5139a SHA-256: bd55b3317b0565ec2252ac9b94321f6e2e13d84516dc1f367181b24d4967019d
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating it's a phishing attempt. The critical heuristic 'SE_SECRET_RECOVERY_LURE' strongly suggests the document's purpose is to trick users into providing recovery secrets or private keys. The presence of numerous URLs, many hosted on compromised CMS uploads or disposable domains, further supports a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://menu2uplus.com/images/file/lokodibewemilimagosirag.pdf In PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/weduzedugemuta.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611611fdd6ec1---xukuvukokepuvut.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b643ac96---72286563164.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/63485918498.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b208421b0---pavusepigafibizinomod.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/54518441483.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/51729416565.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/50157922055.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f72daf46c51---mosifufivogevavike.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607d05898cc44---pawidolajawedijizugurafi.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/79930452867.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/xipanowogos.pdfIn PDF document text
    • https://tuttoadomiciliocn.it/file/61770683706.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/rujikafigutedowinakuw.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/56617040637.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/dfirv98rk0iulv6ks2g14sfj2l/87416079911.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/a11e1afdd0c610d32a8ec473673b2e63/57696344633.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/goromulijo.pdfIn PDF document text
    • http://geose.ru/userfiles/file/23850325687.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/pibiles.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b555792618b---wuzox.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/26924895158.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/86234010161.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/xalomuridumudexowefuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=tourist+places+in+delhi+pdfPDF 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_off0000e3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D1 10780 bytes
SHA-256: cf2df51c38fc383e22d6747a5fbcef358c68f8b35b3dc3905c76ece13bd713b1
font_01_sfnt_off0000fc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8D 17864 bytes
SHA-256: 64fb39094bbdb226bee1ed01dcaffa2d5d0d4e642dfafc0e0a1ffff6d7ef6a8b
font_02_sfnt_off00012b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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