Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6ac913be8d3dd0…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 03:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7fb4b2589023ddab3f86212ae5efd98c SHA-1: e8e70244d570a745bdc38358dbee86da80044d13 SHA-256: cf6ac913be8d3dd0da76ac19599677d341a3ad1daadb742508510a2e56eb47f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=signs+and+symptoms+of+lupis PDF link annotation
    • https://pcparts.fr/ckfinder/userfiles/files/xagax.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/24865052286.pdfIn PDF document text
    • http://fairmonteast1978.com/clients/71195/File/xubelap.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160982e6d67e39---pejalojogoraweruni.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/28082998149.pdfIn PDF document text
    • https://tarsiman.ee/files/file/55847073541.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/ljbqj04rjgdsi99178u4g8v228/bopujefimowif.pdfIn PDF document text
    • http://jucal.es/images/file/pefakuvexelovige.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/11495463676.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/xitet.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/sajowerukovilamivezok.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/duwedoralewetutovak.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/61754626739.pdfIn PDF document text
    • http://veivel.com/userfiles/file/85958140.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c361be6f4f---64558534082.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f252235141---vajizajup.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/woteremakivo.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/38347987447.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/60801204987.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/9612480195.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/97629427462.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160847b24a36fa---41217788189.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26f1bc5f53---gagerotise.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc401dee412---73672155652.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7a373a504---gegagizaxumejofegigarugeb.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_off0000e261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 17224 bytes
SHA-256: d3f3fb7516205338d4aa22c684036a2038cd4de7236b1c061f5d8c3e5771ca36
font_02_sfnt_off000126eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EB 10896 bytes
SHA-256: b6fd63f8e9958754a25631a06dcb61e4d52f83fc7c6e743b610a67fa2ba71dc6

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