Malicious PDF — malware analysis report

Static analysis result for SHA-256 08af4ae228b09cbe…

MALICIOUS

PDF

87.0 KB Created: 2021-06-28 15:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e24402ec6c4c07e45599fb8b8cbd2ae6 SHA-1: c092f9ada1aefe281df260add6ff9cf098a0b0bb SHA-256: 08af4ae228b09cbeb2bf6d6ed8de493b874727612e641965df741b32ef422877
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on heuristics and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://parquesanalbertohurtado.cl/ckfinder/userfiles/files/27495892669.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160773bd7a3ff4---xozofepuwa.pdf
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/94enfrtlkhnaldjtqio7qolf67/73421877797.pdf
    • http://hanart21.com/files/userfiles/file/budukadusirorezej.pdf
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/41462689372.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/9b4c5155813861a67ca6874af2c827df/jonimu.pdf
    • http://liyangah.com/Upload/file/kinexajewobiwubag.pdf
    • http://ptairsupply.com/userfiles/file/82314948796.pdf
    • http://pnktools-th.org/ckfinder/userfiles/files/37625663488.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/64ffc0f11ec6420967d3c1a807c48815/voxuzodemurejovon.pdf
    • https://rocksoliddesigns.biz/userfiles/file/mowavaduwabukarabi.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8a0d7c0d2---29398027904.pdf
    • http://ibconsulting.it/userfiles/files/wizejegizuvurumetiripe.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dd857523963bdedc6c418d861ef9895c/28043540258.pdf
    • http://klpa.net/userData/board/file/tusikejutidafi.pdf
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/89562419453.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/a098942f0fa279f976fd7484544816f4/2639074776.pdf
    • https://cmoretv.com/userfiles/2691204379.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/2735b8f797721bb07e5daf0c24a13aa8/65776245399.pdf
    • http://ozhelalikram.de/resimler/files/4191921874.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/i02mjbmm68r9trdogmie2qdua1/gafatibewixemegato.pdf
    • https://chmelo.hu/sites/default/files/file/95987909850.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/4f6cce4dbd4912616357ff6a720f61af/70876641597.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/171b89c63d640498040707436f3eac49/duvinamazaluginerivuxikun.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2610d0cda---zexalabidisubereliguro.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=persistent+blocked+nose
    • 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_off0000f449.bin
206d10a7ee7672131ad52bdc21163693d8332881bbe978bd1d52ad0f23c84ad2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 16456 bytes
font_01_sfnt_off00011f00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F00 16792 bytes
font_02_sfnt_off00013717.bin
52e2c4d44e16c721b3a1075076e1bf1a9dfa12b393cac0f2da622b3cd3e123d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13717 10432 bytes