Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a18f71ec39c638…

MALICIOUS

PDF

80.3 KB Created: 2021-07-13 23:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d15ed3b78d1cf9779d19c75b0be93b61 SHA-1: 0836d8a1b190ad30f320a54690eb41d204785e35 SHA-256: d8a18f71ec39c63809cdb67c04e4006b49b57e546b39773d788ea45c9170a9a3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The file's structure as a link farm is indicative of an attempt to bypass security measures by hosting the actual malicious payload on external, potentially compromised, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://ehomeforeclosure.org/images/file/90994328576.pdf
    • http://bike-aholic.com/UserFiles/file/71408734520.pdf
    • http://madmojo.com/fckupload/file/xeniror.pdf
    • http://fzcce.com/aimgs/uload/files/51562875679.pdf
    • http://studioagronomoserragiotto.eu/userfiles/files/59945613180.pdf
    • https://murtenhof.ch/userfiles/files/sodadupuwakapo.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160796a84763ff---84787957221.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0e99539cd---13862557998.pdf
    • http://weifong.tw/fckimages/file/82791479129.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5a06ac862---50777471710.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/2ee2f0424e745f830cd3fd478d9eb373/nofodulugun.pdf
    • http://beachfirebrands.com/userfiles/file/guwadadixe.pdf
    • http://bscartridge.com/pic/82357547936.pdf
    • https://chmelo.hu/sites/default/files/file/pegijurezekexixafugi.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/031ec84b2319ba0d1ec145965d00f2a9/34495347562.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/a875dcbecd5e965a442c023fc4baf022/tizuwetabilepilavek.pdf
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/bobobubejoru.pdf
    • http://lagunaapartman.hu/images/user/file/kisomaxevibivevosorenovu.pdf
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/18996219710.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/d3bdfd8a8a932b723d1f63a316a8b940/34654657314.pdf
    • https://cgeminfos.ma/upload/file/kuzunox.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b635105cf3f---moxudezigimumiwawijuxoma.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/29197ab0632ce7a47e931220db2ee124/96357062753.pdf
    • http://beiks.info/public/file/mizugumepijaliravorozileg.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3c1a50d37---xasomeladezepekomep.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=bsc+magazine+june+2020+pdf+download+in+english
    • 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_off0000d3b0.bin
ecfa64bcb3abff5c2e6278da8f0422473c598c2bdc50b51f90124556d9f9ce64
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B0 11540 bytes
font_01_sfnt_off0000eec9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC9 16792 bytes
font_02_sfnt_off000106db.bin
ef3c51b9a0d006df568a2f5eea1efb7ce844b82b9e3fce5138234439a3a8a8f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 17104 bytes