Malicious PDF — malware analysis report

Static analysis result for SHA-256 8284538cf6685d0c…

MALICIOUS

PDF

70.7 KB Created: 2021-09-13 16:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30a44686f1179a062e04355ba44d2969 SHA-1: 05dbf699e88946a649e94a411529316147528f84 SHA-256: 8284538cf6685d0c3eb77b6f22ca17a56ac4db7b02c605779897408238b656cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS 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. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=rompe+claves+wifi+android
    • http://ahcxdq.com/uploads/file/112305312021.pdf
    • https://frontivo.ro/userfiles/file/76183685768.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f61df00bbf---suwamurer.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7c9fd839b---garuzibibo.pdf
    • http://kjphotocon.org/data/userfiles/files/84681653717.pdf
    • http://gsxr.hu/userfiles/file/jukopaloxo.pdf
    • http://lexprikson.com/admin/style/images/userfiles/file/2944913689.pdf
    • http://nissanotogovap.vn/uploads/images/files/tapipofajopimomer.pdf
    • https://pointvirgule.ca/upload/editor/file/maxejosenisiropivab.pdf
    • https://highlander-inn.com/assets/userfiles/files/75055860279.pdf
    • http://mbfeed.vn/upload/files/mukojepafewomepu.pdf
    • http://wcsps.com.tw/ckfinder/userfiles/files/53067987589.pdf
    • https://euroialinsol.ro/userfiles/file/riden.pdf
    • http://att-na.com/upload/xebokorusaxeridafupakewe.pdf
    • http://interroadholland.nl/userfiles/file/wabolovokutixerul.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f515821d51---35145921487.pdf
    • http://royalgoodviewresort.com/Uploads/file/xejisudutaz.pdf
    • http://sushrutproctology.org/ckfinder/userfiles/files/95277580193.pdf
    • http://chornakorn-packing.com/ckfinder/userfiles/files/lufipilininesuzono.pdf
    • http://simsvizag.com/admin/uploadedfiles/file///14440756692.pdf
    • https://textmakareknutsson.se/upload/image/xopubibolow.pdf
    • http://playoz.com/ckfinder/userfiles/files/21467750893.pdf
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/78749006329.pdf
    • http://chiangmai-clean.com/user_img/files/87129169119.pdf
    • http://mydreamtuscanwedding.com/editor_up/pabufivafotikajunekepujup.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_off0000b4c9.bin
4f97d1d867a14de204b9f334566191dd3ef33967e8f19faad931b919ca39ff07
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C9 15564 bytes
font_01_sfnt_off0000dc2a.bin
c309e25d877ba602d7eb06a0e32c55c4bdf09eba751a67cef2cd49e1266050c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2A 10880 bytes
font_02_sfnt_off0000f552.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 16792 bytes