Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ead91cebcadee5…

MALICIOUS

PDF

89.6 KB Created: 2021-08-13 19:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 22a93f3af0901a7b29f5569833525449 SHA-1: da048c22b394c01307630d9c611d00fbe56638a7 SHA-256: e6ead91cebcadee5191c3646be93dd93088296456f8f0b6314deae46e170926e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL findings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=probabilidade+e+estatistica+exercicios+resolvidos+passo+a+passo+pdf PDF link annotation
    • http://szpk.hu/_user/file/javukivezosevigofofoteves.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/wibarevoxutotux.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/08eacabd093bfcbf15061882677349dd/81327337622.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ddf163fd5---vediradimukipo.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/41903947149.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/0b98b0b2a2c1b89b0e8ad69c879bb0e4/vodafunedikobogozixu.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/36664502494.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/teribap.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ia8ud8rr0igesftr6qkpqcql37/28277631385.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160856ca259099---15769952145.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/xudekagasajokin.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/xawudezefib.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe70064c97---66278587398.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/62887460089.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/9c4eb793909ff7bba1506d9ba23276e6/71340842617.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/rsr51kd1v40dlofk7dr2uffm84/97929281875.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/shmrrfjddh12msrrl550p9taeo/narigigatumewomebo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd5fa2a7fa---siboxuzoxotabovexozowosi.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/daxaniji.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/18519675824.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/24508945641.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/rs1ua6avam8334npi7ikjmfspa/37061245173.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/37090896433.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/mujupefizazadulel.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9da477820---313786044.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_off0000f143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF143 20684 bytes
SHA-256: 8a0e7bb1e83b3f9da133f0ea90fda0250b573a1a935d889db206823ed7e74209
font_01_sfnt_off0001250e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250E 10820 bytes
SHA-256: 2ad21c8ee2d42ff0177b5eaea291535ccd23458fe1cfeccaed3c497bfee274ae
font_02_sfnt_off00013df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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