Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28f3674a609f443…

MALICIOUS

PDF

87.6 KB Created: 2021-07-08 00:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2e803af243228ab0a63c13d8c3c36dc SHA-1: a263e72da7a394998271c53f480e029db7a32434 SHA-256: f28f3674a609f4439922ca6c242052bf0e6b1aa558ccdefbd76169a5caad1599
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farms on disposable or compromised hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://dulichgiahy.com/upload/file/tosibapulivowezo.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/a9c599ac75310c5cd62a2c721ca87e87/91687767613.pdf
    • http://nacyc.jp/Upload/file/31214509241.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6f2379b5d5ac80e522c5da46461af495/votusivedabaxav.pdf
    • http://zaun-produzent.de/userfiles/file/87586559605.pdf
    • http://www.yoko-ono.be/images/userfiles/file/88371377451.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cdf6572d0---61569320976.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/f1ff6c5d562c555b848e695c312ee4f7/45503454591.pdf
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/fidovege.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/e2804ca10f73750c22087129701dfd88/82691130933.pdf
    • http://fw-simple.com/uploads/files/patadamozalomikoxesofufo.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b62a0b4f35f7b7c2868ad418f48525ec/78213469681.pdf
    • http://dobrasekacka.cz/userfiles/file/50157191624.pdf
    • http://christopherdallo.com/file/jifut.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/1cd35892598b69b4c47303e7c56b02f7/pevazekifuvesagopibe.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7eb593433---lukaliwijewojirip.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c55d7be54---ledivulimubuwajirelokod.pdf
    • http://jnnycc.org/userfiles/file/95457991785.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b33393dfa---78922630795.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/99d93fb07bd9699395b45cedcdfb7ac7/meboxosetodojekozopedov.pdf
    • http://fairway.cc/images/blog//file/rorumaxetakopimonujifiro.pdf
    • https://dewalt-naradi.cz/media/upload/editor/file/masenoxuviletebakulopa.pdf
    • https://arerp.kr/data/file///watibutubad.pdf
    • http://imhkayseri.com/resimler/files/66760542638.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=eng+to+spa
    • 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_off0000f815.bin
6c2e4825a73d5985353a5db9a06891a5541a778bdfd82fcd87f8238249821066
pdf-font-stream PDF embedded font (sfnt) at offset 0xF815 10040 bytes
font_01_sfnt_off00010e86.bin
80aed56d490dec713a29e01f2dd576cfbfd1972e5ed73b8f84e6a9e4c64e8ecb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E86 16492 bytes
font_02_sfnt_off00013968.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13968 16792 bytes