Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41fba6fb0856d30…

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 00:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 293db7a28aaf74ebc5a4c0cea5c50a2f SHA-1: a20663baf6f426295c8d31fc37e69609cf8f9086 SHA-256: a41fba6fb0856d30e6b20af5fcb6c8b777ef026aeb853c5535e70c6636d4a909
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of a 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security scans and deliver malware.

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
  • 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://inwebjor.ru/uplcv?utm_term=keynote+app+for+android PDF link annotation
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/9461493647.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/gipalisakuwodesamutaj.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/75473170109.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/70421128482.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/17600965480.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/31117833027.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161410d8acf3d6---dotelabekusatogoves.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/zejopuruxop.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161410de3122f7---34895601597.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/75267646847.pdfIn PDF document text
    • http://webs123.com/userfiles/file/pepis.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/zajafifojax.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/59963256951.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7220ee71099874ba176d6774cd45b16a/30025299416.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410e65e691e---73828171330.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/79666670734.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/88087309719.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/zavukuvizazulikewogigoleg.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/354588655.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/63600106121.pdfIn PDF document text
    • https://coluer.ir/documents/file/jaditizetori.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/wuxubanoxixesawarug.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2787857e9b649889e528210a07a05547/jivopoberiruletisovogob.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/monefoduxanuraja.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/mepuzujidisovosujo.pdfIn PDF document text
    • 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_off0000de89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69B 18032 bytes
SHA-256: 325b2406f861b125d795450be6c5bba5d69f86d193650d576da484dd1f8dac92
font_02_sfnt_off000125dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DC 10384 bytes
SHA-256: 3c14ab4d7ecdc8556d0e2f579087d72aea32bc7363e149a3e021585834b8c8fa

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