Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2f044e81f88b15…

MALICIOUS

PDF

87.9 KB Created: 2021-07-13 18:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4d73b037f7000b714a3a8cf5f9545939 SHA-1: e573e4c12f788a441541d57888c2a52de82caf6b SHA-256: ac2f044e81f88b1586fffb3c160bc242dab66b349dcde81b2bc1d0e9cede788d
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, many of which host further PDF files. This behavior is indicative of a phishing or malware distribution campaign, where the initial PDF serves as a lure to download additional malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/6954953c06c91950791173dafc10ba2f/memafelowipawude.pdf In PDF document text
    • http://nowyhotelik.pl/userfiles/file/jomitadofikodix.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/dmdke94fk6o16eg67pp34em7mc/48623785772.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/serivokatoreditobu.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/71104761782.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/bafuputavatigavumas.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc344b860a---degorudafox.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/27740819656.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/patusizitagu.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0cd381111---47472812501.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/qd6c88t01v2m7ejshgfig965jc/85305834653.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/86063740662.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc1e1cf48c---66987313654.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/dumudidinuborizus.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/66ac65a4b65a1f2c532927cf2385ebac/22183657656.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/22d7589d810bc19b96a4085ea768eedf/79990448452.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dc10a48be1583d6a0fdc529ad5d9e9cd/guzivegogaxagepagodoj.pdfIn PDF document text
    • https://bloomeng.com/uploads/fosifazevumulapamagajejag.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/92976081167.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7bac6f9f1---faxobusufurubemiwelisa.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/639788b39355379a6dfc244207510cc1/sebaxovejupix.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/vapukagif.pdfIn PDF document text
    • http://vhktn.at/images/content/files/22460569685.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/ravazidaxuxedemegoro.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/nadekunobijaramive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=kate+middleton+and+prince+louisPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D2 16808 bytes
SHA-256: 41c8dca41b2ad6bc420b57ed5a461b10881304a537d54129336fef95358a93ee
font_01_sfnt_off0001216b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216B 10764 bytes
SHA-256: 74a26a27cfa8cbf9bda1af6b1bb92096ac108dafddc2e1b6b55ba55c2150fb5e
font_02_sfnt_off00013a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1