Malicious PDF — malware analysis report

Static analysis result for SHA-256 62380e65d36d1326…

MALICIOUS

PDF

89.9 KB Created: 2021-07-31 16:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 29664b94131cf7f2249bc80ab0939a5f SHA-1: f120fc4c15da4c6bbfb63f552e981a60b6e3c448 SHA-256: 62380e65d36d132660b8288e6861b5b047592a7d08a80da5eb0e57a3a9719fa9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external URIs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure and URL distribution strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://krisoc.ru/uplcv?utm_term=respuestas+examen+psicometrico+evaluatest PDF link annotation
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089740eee50c---46628931222.pdfIn PDF document text
    • http://computerdoki.hu/user/file/74140503074.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/56322528607.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/kamerevolugufumetoke.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751dc02f142---jalumapoj.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/27755073597.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/75897170482.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090c414433ed---82295411309.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/79358639144.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/jubamufiwejozunad.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b0d11315691518a0d58b059f7212c1b4/musowulegu.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/55845318256.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/49ab4649b147aacb6213b903ab6bfb11/munerejofemenu.pdfIn PDF document text
    • https://dhesient.com/media/jaropunawal.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e7035979289615f569e1853005f1151b/82314050983.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/2be6e348783ec014063f0c889f11eb3b/kamorenes.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/jabig.pdfIn PDF document text
    • http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/25342574534.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/f90aa3607fdbddfb60fd41df4142d786/32505750509.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67ae53e457---9633060363.pdfIn PDF document text
    • https://onlinendttraining.net/files/9472628631.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/80593831974.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/ff68b4f73073208c1206ff845505031f/79289600167.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_off0000f7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD2 18140 bytes
SHA-256: 6b25f305497cae77c94225caa78aaa6f33f05171a5cd602ff4483dfcc79b08d0
font_02_sfnt_off00013ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC4 10848 bytes
SHA-256: d0dad5d8434ef44fb0b4244b7c33f5459f7b4613448370638201d68cee8f0b7c

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