Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e0de33286c3a19…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 17:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: faadbf3b9724ad7bb1bc776b9fb9910f SHA-1: 29ab1884e3e5e2bb4ff558976c983161763aeb3a SHA-256: 80e0de33286c3a1959c5146cf361174656398e5dea3d19618dc73779a8926862
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a 'resignation letter' UTM term in a URL suggest a phishing or social engineering lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=resignation+letter+rejected PDF link annotation
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140abcae4494---53730098387.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/lomalofuxudiluximenun.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/lozoguviw.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/33639176131.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/59583645606.pdfIn PDF document text
    • http://potlista.com/file/files/zavukatij.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/39083731715.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/sapumizifaloz.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/ronoz.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210913195349.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/31741176606.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/lupujazuvisafumifumi.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/elooau4kpongd8noaeck541dn7/juxinilexativonon.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/fegilufisaxizepadomakale.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161472af16db51---81976824934.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/zufusosabefutu.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/39570418254.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/17703324824.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/21748623126.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/15820768540.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/9oue32j2iditqrqi7qc10p1ju4/dojex.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/fikaluxijukuxujuvigalo.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/tukidudemije.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/37207345076.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_off0000da94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA94 17396 bytes
SHA-256: 4c5a14a8275f31944114348024c576a0a8b3dd879560a74519bc6ee9397b9e5c
font_01_sfnt_off0001073c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073C 10720 bytes
SHA-256: 7cf6f918d663bd65ee32e47ad78a7e56a75db1984b06a6fd1c85dddf8e9fb9b0
font_02_sfnt_off00011fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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