Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf360335dde437b…

MALICIOUS

PDF

95.9 KB Created: 2021-07-02 03:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 107224ec95e898a2dec2b734279e9289 SHA-1: 77e954c9226a30f821e6f0dc031b88380b873984 SHA-256: bdf360335dde437bc8b5794234f5f1d3a74475079a13ffbd16ff9295fcbb5eff
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs confirm a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://agatanorek.com/files/file/99660989260.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/eb5653002e7bae218da073a7a06d84ce/feponazusanorekusodilo.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3fcaf25cb5c28b61ffaaf81680443d21/66295480867.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/o8trmpqmrve205776qdmu80p4i/fidifofebogokisogapo.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dfd2e63f2---8425848702.pdf
    • http://salukool.ee/upload/userfiles/file/8199531304.pdf
    • http://svsteinfurth.de/radsportfiles/file/jegikero.pdf
    • http://barcelonasixtytwo.com/userfiles/file/vugopipopebetolamexozuti.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5aa10f271---fizawoxufob.pdf
    • https://castilloexterior.org/ckfinder/userfiles/files/sulefuru.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9422df965---tuzezadive.pdf
    • http://mkngsp.ru/upload/files/63514970446.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c988d501a78---bifufawug.pdf
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e010ca63e---15637600698.pdf
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/81790674051.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a598761d487---85676765610.pdf
    • http://nickels.design/ckfinder/userfiles/files/vopip.pdf
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/nikota.pdf
    • http://tizianaiberti.it/userfiles/files/gakesenurutowonafen.pdf
    • https://kopari.hu/files/file/fodibugow.pdf
    • http://fkhd.cz/data/img/24179888445.pdf
    • http://mu-rrrc.com/userfiles/file/14369602881.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6f3ab769---kavimuja.pdf
    • https://vestol.bg/files/file/vinujepesipa.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795f4280707---69997352985.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/s72h6tb90fitisct9arkr9u7a6/64734292735.pdf
    • http://ptairsupply.com/userfiles/file/vofapelewogobofoladasowu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=interview+questions+and+answers+for+c%23
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011215.bin
1259e60cd898abaf2c92e126d3d6892173ea8642fc566fa46c0c7f52b0024c1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11215 18028 bytes
font_01_sfnt_off0001411f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1411F 16792 bytes
font_02_sfnt_off00015936.bin
b058f5a4d544903c1b88fd1e710d15997edc08821c241540249b55404b925f05
pdf-font-stream PDF embedded font (sfnt) at offset 0x15936 10772 bytes