Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef6810b8261db50…

MALICIOUS

PDF

116.9 KB Created: 2021-09-01 16:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ab80241fa986ac6ce47f42a606b31e3e SHA-1: 1b9ed8136052c4f58c63b22cf41f1ece2f86fedb SHA-256: 5ef6810b8261db50c77173ebafcfd273c8a656f973691a6cce2b6fff29ddb87b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware through these links. The presence of 'utm_term' parameters suggests a tracking or campaign-oriented approach.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://huntic.ru/uplcv?utm_term=weep+second+form PDF link annotation
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f905da10d5---kuxoruwodanobibov.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/1920497191.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/64526071969.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ce74c656ffc3364049fb752b320aa2c/20473041459.pdfIn PDF document text
    • http://miele-service-center.ru/uploads/files/tutodoxapasi.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/7943409750.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/87773645729.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/ronasavofaxiwameban.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/mutudiwilosivopabisag.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082c18283787---bojenumupepisu.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/pasaduvubigopazevetofitug.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/bilapavetojekagitejaxa.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/dajowopujofulujejubeke.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3d4803b2ca6281e0cbe2860b7e280f1c/31581536548.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/gepasduod5it3cga0g0c24v2nl/pilowiluvironigi.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abafc59b607---deturifawifuvoli.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/25003931096.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/8455072849.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/78d341267acdc94655414847d18c63fc/garagejedofawapatidogobok.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/53932535789.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/68578231010.pdfIn PDF document text
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000164b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CC9 10376 bytes
SHA-256: cc364ad142b0984cf0e58bf1ce4f427968c6466fea6de1b7bc681408731300b4
font_02_sfnt_off00019436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19436 19252 bytes
SHA-256: 3d0d0fd7708f8868c39f9f299354bb1dc1307ca9334f580c832979c13ecc04a7