Malicious PDF — malware analysis report

Static analysis result for SHA-256 c606b13e888d406e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 01:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cce9e3c037e5b7ffe15755ffd0d1c858 SHA-1: 2cae28dad05c5cd26d4202f6d2d4fa9fbc9defd2 SHA-256: c606b13e888d406e875be2be8c1f0b9a41d087b1e96cab0e78e6af82f42b51a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

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://pixomot.ru/uplcv?utm_term=how+to+hack+robux+on+pc PDF link annotation
    • https://12tiga.com/contents/files/jotoseku.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/zirakep.pdfIn PDF document text
    • https://inks.bg/userfiles/file/gikobujubakozudazusexo.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132f2533e642---17799929379.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/23099452630.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/68567574801.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/jotefivezukexamavuveripa.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/32e06447d489c8ed3a9e03b20bbf62b8/6421237599.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138199c60ed5---popilepe.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/632e81105cbd5b93473d32f52a6eca50/dadopozitajutoguwa.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/vumugetewimoromar.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/44028402269.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/66149923931.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/ziwevan.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/19cd8f595db7562e76772511700449fa/47844930457.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1c42380bf---53532438873.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/vuvibevobugokekoxufo.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142670388f6f---60965614607.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/jisaweselibodekiweka.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/binetudiwolaxaloz.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/1278389342.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/8d0c2c47a39e0b4e7ede997c9244d4c5.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/193509eb3a986a95725616c830ea8580/91560154742.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/xapivalufiguluxonipamijim.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_off0000d8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AC 10544 bytes
SHA-256: 0586931198f2d9af7fcf426026ea57269896c3345e7ab449ae5953d773b1528c
font_01_sfnt_off0000f07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001088c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 17996 bytes
SHA-256: 2af171cf4983ba94535f20bd1b5df018c6c9fd2d365e1685ae43e784469e0110

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