Malicious PDF — malware analysis report

Static analysis result for SHA-256 f236262570881c3c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 18:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e1200a971bf14df649aaa6ebac8045c SHA-1: ebed1817e70e7c49660b5304bbd45b864b547525 SHA-256: f236262570881c3cec042bc777a962db362190a9315c7e45ab1bcba174a9668c
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. The presence of a 'download button' heuristic further supports a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=how+to+convert+pdf+file+to+powerpoint+2010
    • http://aqbnb.com/uploadfile/file/fawedizapezitirozuleliza.pdf
    • http://rc-modeller.se/images/file///40450910472.pdf
    • http://irina-beha.com/ckfinder/userfiles/files/minugitadutulu.pdf
    • http://meuble-tunisie.com/userfiles/file/88820029718.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/f124d9f8690baa91f238581ba74d3cd4/nejuxiduwiburuliv.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/c9d54a92506edbeef136382d83ae3066/99598248692.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/peeehcd10j6i2uvkl3tm991vk1/57667603847.pdf
    • http://motorlustor.net/userfiles/file/rojosojumosenulup.pdf
    • http://librojuridico.com/aym_images/files/28665076288.pdf
    • http://angeladaniel.de/uploads/files/25627074485.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f9ac7f14f---gilajutabupatibasapi.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/feeacdceec92647d78e12f9dbf158fe9/bofaxamevumimimifawirivi.pdf
    • https://pastelbuilders.com/userfiles/file/76231115590.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/99669141523.pdf
    • https://macroedunet.com/userfiles/file/34667022275.pdf
    • https://eseninternational.com/uploads/files/negevugatuke.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d158d4970---lujapedipoxew.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/a6c5e4877854c60f7707465a1c17434f/11311470406.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/72aa8ecbb98e16ba95ecbe919aee54d0/2455422340.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/ln47q1mgl89cunc29mm0jirr5h/pisatinojipokun.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870e85815c9---soxulopenofojijopozepodi.pdf
    • https://kaptenhoki.info/contents//files/9451385655.pdf
    • http://karimeh.com/public/userfiles/file/fezurazunizaneviriz.pdf
    • http://sourceandsecure.com/uploads/userfiles/file/vorizisiraragivoxixi.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119114d89e41---13209543175.pdf
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/fobasutarenawewifimudak.pdf
    • 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_off0000daca.bin
60e213a103f3ad9844159280e59c164b12ca528f6da374d01c0e8ddceeafac0e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDACA 18256 bytes
font_01_sfnt_off000109a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109A5 16792 bytes
font_02_sfnt_off000121bc.bin
bbacb43ecc1d309e498558efb5cfb6861e7a33ed504e59e18786fab36f2ac17d
pdf-font-stream PDF embedded font (sfnt) at offset 0x121BC 10720 bytes