Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eeb2c4a7cc9b820…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 07:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7845fc93b5cd6008f5ad401b3a3b8e22 SHA-1: 484753a258ae9224ecf21cb735a432d77f8fba51 SHA-256: 6eeb2c4a7cc9b82086318a2bf5502ddec520e8f233ad5165ae3b1b589b79785e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://wastran.ru/uplcv?utm_term=loco+contigo+line+dance+pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e4fa286a8---39205852860.pdf
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/81947056750.pdf
    • http://phuongdonggolf.vn/app/webroot/uploads/files/91470892528.pdf
    • http://faradbox.pl/files/file/32283583432.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825e3552ddc---numuzobadidoduxid.pdf
    • http://pengyou-english.com/FileData/ckfinder/files/20210815_8BD20B6B04093388.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983cbc76722---jeladimagepirilowoxijume.pdf
    • http://riversedgefm.com/files/file/fomakimi.pdf
    • http://provia-events.de/pics/fotos/1/file/5699608841.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b67c1825eef---84680113471.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/e701928872b35ffb0240348e68e90c18/jitazituwi.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/67tev6n53q2ud6u5g6fqe8kn7s/nozexaxut.pdf
    • http://ajivikafinance.com/userfiles/file/62648732998.pdf
    • http://goldmustang.ru/files/files/69316237563.pdf
    • http://saharun.org/uploads/ckfinder/userfiles/files/xokasonajimeporuke.pdf
    • http://webinside.pl/userfiles/file/varigelozalumifigufamer.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610003f03bb13---19275467202.pdf
    • https://fototipia.hu/files/files/55484382318.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16085043e603e9---134554062.pdf
    • https://sanghvicranes.com/staging/media/89546030593.pdf
    • http://refah4ter.info/basefile/hotelrefah4terir/files/18094374950.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/fc0778a31fb1baf44442c448c4feb4e7/xakamuwupojuwajimur.pdf
    • http://inglewoodreunion.com/clients/68690/File/vivofejofomedezi.pdf
    • http://ergakiland.ru/files/files/35806677116.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_off0000daa1.bin
19665f04b810eb9999a73a6f618602a8ff0000603fa3ff963daf9d7c80dbb789
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 19364 bytes
font_01_sfnt_off00010df5.bin
e11eb0b93363bad34cf03a3369792bcd55a27f73b27b205cb294d99599a2032e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF5 10484 bytes
font_02_sfnt_off000125ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125AC 16792 bytes