Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8c48614f1f704f…

MALICIOUS

PDF

85.8 KB Created: 2021-08-25 22:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6380bcc97eea9f889960f6f04fb31a60 SHA-1: a96a419048aa20c2454ae8d44f35a8d8532ab8a7 SHA-256: 8e8c48614f1f704f69dad39189ee09fc1c930d1abf73927d1c32d78d7c23d863
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external links, many pointing to disposable hosting and compromised CMS upload directories, indicative of a link farm designed to obscure malicious destinations. The presence of JavaScript actions and ML classification strongly suggests malicious intent, likely for phishing or malware delivery. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jfk1969nola.com/clients/873000/File/50070533375.pdf
    • http://yevres.fr/ckfinder/userfiles/files/xinomunixekimebazagivet.pdf
    • http://geometramaurotozzi.it/userfiles/files/9809146066.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161184a8128c26---dokafapexopos.pdf
    • https://aymfly.com/aym_image/files/19154583782.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ekr8bh5cc4dgercl18hc37humh/90434995408.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4527381b28---rolavokabomemujawowuwini.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/lrm925smk23j7r5k29676ikuv6/42947877373.pdf
    • https://strategie-forex.com/ckfinder/userfiles/files/77171187576.pdf
    • https://ww150006.linebot.net/upfile/files/20210824054619.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160765bf210049---21260570679.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4bd927c94---podesegadaxubuvewozes.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c47368a779---31944245472.pdf
    • https://champion-osk.pl/userfiles/file/jararurobiwez.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/q0c6ac7bb9510pfl6451f3v1ti/zizukuxototuvixa.pdf
    • http://xn--d1achljw0b.xn--p1ai/content/upload/30203534568.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d3075604eb47980bcc2e62bdb54b593d/merasubi.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9eb9d9b42---81579188533.pdf
    • https://irisapp.cn/uploadfiles/fckeditor/20210730/file/16276325917650.pdf
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/nanojikejinege.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/247f8007afca870b55c1796ac1786b51/sunutijidanov.pdf
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/92612803979.pdf
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/97523200201.pdf
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/bopameni.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=internet+technology+and+web+design+o+level+pdf+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_off0000eb02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB02 16792 bytes
font_01_sfnt_off00010319.bin
1f1a60f9a406a4f7a4602f1a385fe2ef6283074b88bf89214e98b0d169c831f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 11256 bytes
font_02_sfnt_off00011d1b.bin
68b82c48e624b1d42855b1a5c231f5d35a381670c3971504ce25f4c3e51e57ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1B 17212 bytes