Malicious PDF — malware analysis report

Static analysis result for SHA-256 151502eb0c142ea3…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 23:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3de8a74ebcc13b4c873418f75418547 SHA-1: e9da05af5b41d4496ca058a50957d74e2e9af00a SHA-256: 151502eb0c142ea3b02177318f28f35ca81dc407a3574f4089be22c3971fdd40
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, many of which are hosted on compromised CMS uploads. The primary purpose appears to be redirecting users to potentially malicious or phishing sites, leveraging the document as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/stjn53on2ks0lcm99rhv6fq4s5/72615913253.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/11ef7139f145a3f9a1afc2adcfb2d96e/ritizotejosedokeja.pdf
    • https://osikovo.eu/webroot/img/content/files/wekulimikerozojemutexakus.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608cddfd74275---laxenazexuwora.pdf
    • http://katachizu.com/img/news/files/33245992219.pdf
    • http://www.bluefashion.cz/ckfinder/userfiles/files/kiwixopanozikin.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/60ed6db4ad125b49af0151a06f4e79d0/gavamesebatogekag.pdf
    • http://cyklo-sport-servis.cz/UserFiles/File/takixarevubumirumakorewi.pdf
    • https://burgaseguros.com/userfiles/file/87036129309.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ha98b4bk88rooqrrk0gl02i1s7/rexelokide.pdf
    • http://orthocarecentroortopedico.it/userfiles/files/50349538515.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/tesebowupoliluf.pdf
    • http://yngc.ru/admin/ckfinder/userfiles/files/61545619440.pdf
    • http://abc-tel.ru/data/File/wudalitobelepu.pdf
    • http://worthingtonpark101.com/userimages/xonakezolone.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5a475f45e---92063028485.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f792e2bd2e2---kajomunabilepo.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082494d5850f---68738243279.pdf
    • http://indago-rovigo.it/userfiles/files/54535175627.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/bjh2d5dqogga2kle5ujkr83vbs/22653540173.pdf
    • http://titadoorbinhduong.com/upload/files/nidikidonirozivinelobe.pdf
    • http://atol-res.pl/uploads/file/11323446022.pdf
    • http://savalis.ru/userfiles/file/14015439606.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=7+types+of+triangles+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_off0000dd39.bin
f02ffd9913649e1de94efa52b4998cf9e19ad493635f1ec644c357b9800f14bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD39 18984 bytes
font_01_sfnt_off00010e97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E97 16792 bytes
font_02_sfnt_off000126ae.bin
a70e20a3e03f1dc3ce77c14357977a7be34d47161a2fd52cb1f6f96ae0c44fee
pdf-font-stream PDF embedded font (sfnt) at offset 0x126AE 10740 bytes