Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03340063630298a…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 18:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0fee54eb894ee403170ece50ffbf9c6 SHA-1: ea3b979f9e28d1f757f3abeee0a8c721625f7dec SHA-256: c03340063630298a680434332727087efc5155612e6ad8ad1bf0cbcdfe98f009
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. 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 https://crewmak.ru/uplcv?utm_term=android+uygulamalar%C4%B1+haf%C4%B1za+kart%C4%B1na+y%C3%BCkleme+rootsuz
    • http://murasakijr.com/uploads/files/kowuwupimewomov.pdf
    • https://mirrorlink.com/public/files/files/44873322655.pdf
    • https://seeandhearbetter.ie/img/shop/contents/48772120632.pdf
    • http://gcsiva.com/files/userfiles/file/43440025656.pdf
    • http://hoanggiaphatland.com/uploads/image/files/wunijezogirejejo.pdf
    • http://deltools.com/userfiles/file/wekazorawejagenasaxoga.pdf
    • http://noithatdangcap.vn/app/webroot/uploads/files/16704882752.pdf
    • https://galaxytraining.examinationonline.com/files/24669777149.pdf
    • https://autohausnschmidt.de/userfiles/file/jorukojo.pdf
    • https://ibexquimica.com.br/ckfinder/userfiles/files/xuzosujenerimupetivonumu.pdf
    • http://dispensapertutti.com/userfiles/files/lowovusopipilelon.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/125257ee4df3cc8f4c2b31f6dd2d6362/51627525344.pdf
    • https://trieurodata.ro/images/file/pebalekitixusijoso.pdf
    • http://poketomecam.com/uploads/files/fijapamisoxigizev.pdf
    • http://ct-tci.com/cttax/userfiles/files/labikogaluxazenigukejuna.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161350448ba333---xozupevo.pdf
    • http://jtg-antracyt.pl/files/file/28896220321.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/38008458954.pdf
    • http://taketty.xyz/js/ckfinder/userfiles/files/52052311864.pdf
    • https://clickbox.ro/images/file/3819395645.pdf
    • http://homearcky.nl/userfiles/file/79250376887.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143de7f49779---tunolu.pdf
    • https://alakharia.com/public_html/userfiles/file/37040483147.pdf
    • http://tunesistudio.eu/userfiles/files/24555873061.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_off0000d46f.bin
d66acd536d52b3cd87087b3419a8f8c28d3882154451a6e15484e4ea7bd4f723
pdf-font-stream PDF embedded font (sfnt) at offset 0xD46F 18228 bytes
font_01_sfnt_off000101aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101AA 16792 bytes
font_02_sfnt_off000119c1.bin
ff06186b8ce268382d6bea83f1cf611750a046a5b0a61028af2b6a8a67d50880
pdf-font-stream PDF embedded font (sfnt) at offset 0x119C1 11384 bytes