Malicious PDF — malware analysis report

Static analysis result for SHA-256 b593631b6d435c61…

MALICIOUS

PDF

92.0 KB Created: 2021-07-17 00:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b67fa5386ce1c7feff1b898a700e0299 SHA-1: f0fe78d9679b9ff74250712d389f8007af1ac5a4 SHA-256: b593631b6d435c6169d1871055c3ecc1fd22d6788e1fb82593e19aa3b1627930
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The presence of multiple compromised upload links indicates a pattern of hosting malicious files on seemingly legitimate but compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e8419b8ce---jutejaditutuxutomagegi.pdf In PDF document text
    • https://fnb-concepts.com/images/uploads/files/30851996672.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/biwufotate.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/d6c63cac73ffb8e01a7a607513f3b9e7/85893535209.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e80081d32---pigopidenakubimamawu.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/xivibilopixufudota.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/15254619713.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/wubexoziw.pdfIn PDF document text
    • https://slide-bearing.com/d/files/94635933179.pdfIn PDF document text
    • http://wfuchiomega.com/clients/4/46/46a815049f9cfb11ab63b386d19cdfb8/File/jakesofuz.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/9280331597.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/nokaxatonepoxi.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/42759563347.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0d892551c---2797553238.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/a26053b3779bf6305f39fd3f41197eb1/rogifunipejodoki.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac7b9c34f2---kexuzufevavosux.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/39117938047.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/22301763243.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/kuvinowo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080d840e60d5---75465567404.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8b327c4ab---vuwezuvepufaritaf.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/22603377747.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/68463900183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+avengers+movies+timelinePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10430 17288 bytes
SHA-256: 6002f1e2eb84fa814aa54e804fba239e059b6ee5b545460ad98c9b8a2b4e4732
font_01_sfnt_off00013129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13129 10584 bytes
SHA-256: ba79db0ae9d8c079569d8f6f6133c33151378aa0dc909c6eeca5e6865603bf00
font_02_sfnt_off0001492a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1492A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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