Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c3e44cc7d340e9…

MALICIOUS

PDF

71.5 KB Created: 2021-10-01 02:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfe4fb597ad265b29cd39db20b218782 SHA-1: 8fb0a4e43c5803c33262494c598ab924430c9181 SHA-256: 84c3e44cc7d340e9b61a19a14bd0b7cdcdce3c837c2429bdf7349f5b682a4935
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous URLs, some hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The embedded URLs and the overall structure point towards an attempt to trick users into visiting external sites, likely for downloading unwanted software or further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mamtaniketan.com/userfiles/file/delanokowabaroz.pdf
    • http://solarexperten.ch/fckeditor/editor/images/file/bidegukibad.pdf
    • http://firmykominkowe.pl/Obrazki/edytor/file/mixosezewix.pdf
    • https://gogreenonline.net/userfiles/image/fckeditor/file/81626053717.pdf
    • https://officialbacknumber.com/editor_up/difilokexa.pdf
    • https://voyageaventurenepal.com/upload/files/bozazoxijo.pdf
    • https://solelane.com/ckfinder/userfiles/files/nefelaj.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161444e1eafe78---58854653157.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/d2b328f5d31c381820303921e7fa30d1/palilopevofuvokanani.pdf
    • https://caribemed.com/userfiles/file/29642887920.pdf
    • http://geasit.it/userfiles/files/sawixizubivejopelerow.pdf
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/16815656038.pdf
    • http://qiangka.com/ckfinder/userfiles/files/gafobugorubut.pdf
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/wedatododaxaw.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/mujolopegoleparor.pdf
    • https://duproject.com/uploadEditor/files/botel.pdf
    • https://specializedfacilitymgt.com/public_html/userfiles/file/4906564898.pdf
    • http://delannahotel.com/user_img/file/wugutadujokebinapodir.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130ef7942dd8---53022638323.pdf
    • http://saigondome.com/uploads/userfiles/file/zedofipenadi.pdf
    • https://balaji-technology.com/userfiles/file/sodesosamuzaw.pdf
    • http://eiffelflowersquesnel.com/userfiles/file/moxali.pdf
    • https://theelementrama9.com/userfiles/files/15118254574.pdf
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/19913986815.pdf
    • http://myucmas.com/userfiles/file/13279841285.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=subway+surfers+download+pc+apk
    • 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_off0000b361.bin
6605854efb0aa4760eeeedb7edd405cada85eae89746da96312ea6897e993ed8
pdf-font-stream PDF embedded font (sfnt) at offset 0xB361 11028 bytes
font_01_sfnt_off0000cd09.bin
f842dc675531ccdaf4f68df9af073ae396d24b59efc2011b5b52d2a029b17d5d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD09 17140 bytes
font_02_sfnt_off0000f8be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BE 16792 bytes