Malicious PDF — malware analysis report

Static analysis result for SHA-256 b47272e263441968…

MALICIOUS

PDF

85.2 KB Created: 2021-09-11 13:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0bf70e382bef6b95cedf9efe4a3fb1c SHA-1: 37f596faa44e432bde524a35b68ed0d2be80c11a SHA-256: b47272e2634419688162bda793729644d34be006fbb31b820f12b37931158244
176 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, forming a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to redirect users to potentially malicious or SEO-manipulated content. The 'SE_QR_LURE' heuristic suggests an attempt to trick users into scanning a QR code, further supporting a phishing or redirection scheme.

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://eskuvotoszkanaban.hu/editor_up/gavibazunifijipazugulu.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/9e2d32e2d1a434b5a552db8dbe6bf400/tigafivubibupijix.pdf
    • http://sunrui-ti.com/d/files/55425429371.pdf
    • http://mingmitrcoffee.com/user_img/files/82712612190.pdf
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/71922527200.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613516dccc429---remakotaxosig.pdf
    • http://aimecostruzioni.it/userfiles/files/noxajunifejegijelisiwit.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130230f7f2c4---kunulezoxi.pdf
    • http://szerecsen.hu/editor_up/sunudawuvejomujutub.pdf
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/88674988378.pdf
    • http://atenngo.com/admin/sites/site/documents/babipetu.pdf
    • https://suthuytinh.com/app/webroot/uploads/files/1835154828.pdf
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/64798525843.pdf
    • http://shimamura-mail-order.com/userfiles/file/rusujojodabamareralonura.pdf
    • https://www.sophrologue-nimes.fr/upload/news/files/kimolesoboraximelope.pdf
    • http://paolacaone.eu/userfiles/files/boxezotutefumomeduri.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/lhb2olruh99mjv3omf5krr2kuu/61205161815.pdf
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/nixebifodokesubarare.pdf
    • http://agro-pasz.pl/ckfinder/userfiles/files/dosujupadutijogenuz.pdf
    • http://ozdesignhouse.com/app/webroot/uploads/files/73471065157.pdf
    • http://miryangpension.com/FileData/ckfinder/files/20210911_5D0BCDD432E35DC9.pdf
    • http://195exim.com/datas/files/70758020295.pdf
    • http://teedinmaesai.com/user_img/file/27588237792.pdf
    • https://umutisi.com/umut/upload/files/puxataruwalonin.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+view+saved+wifi+password+android
    • 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_off0000e3bd.bin
e98162332bde026c649ceac62792dd5582dde36cd389c17b05725e3a65f54c2b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BD 10588 bytes
font_01_sfnt_off0000fc14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC14 16792 bytes
font_02_sfnt_off00011426.bin
5c9c11bcb88caeeeb4558f81a72a4962eb1f530ce084b465fe3299cdb1f0a260
pdf-font-stream PDF embedded font (sfnt) at offset 0x11426 19452 bytes