Malicious PDF — malware analysis report

Static analysis result for SHA-256 884353019bea8e72…

MALICIOUS

PDF

80.5 KB Created: 2021-09-09 23:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8ca55ad097d5dbbb651d96603dfb33a0 SHA-1: 9f4f6ee20e30f52ac990347da67d137d36909348 SHA-256: 884353019bea8e72bccfca2977657533795209482b19bba959795dc990ef97ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on distinct hosts, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://movitecnic.fr/ressource/site-image/files/1614980528.pdf In PDF document text
    • https://losaltos.com/wysiwygfiles/file/77576109376.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/gazililerivawekana.pdfIn PDF document text
    • http://full814.com/upload/files/52124726848.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/45579808003.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613850f73d4a3---50284986012.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210906011105.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210908_D22BF21E173FFB36.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/tamamelanabikinuxup.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/96257012230.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/39755109742.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/81300404413.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130dbb03dbc2---21718283662.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/punemuxomone.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/84631906238.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/sifimifudoneleduted.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/19013623198.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161331bb837ccb---4287182628.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/c072272fbbe7973fce34c070c00d63bc/6626534909.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/gezukoragune.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/pudoxalujenosev.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/af9a5819cafda390a1144527e529f8eb/tekerabol.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b49b72dc8a73f2fcae4e0de402badbf8/xisawekasimowapijerijoj.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/31879826627.pdfIn PDF document text
    • http://bociany.sk/media/file/buzirajulirobipavatowukel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=android+password+hotspotPDF 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_off0000d817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD817 17212 bytes
SHA-256: af100cf17175906f03a24b724d20b2fd8a818ad77e6ae8506b85b9fbcedba757
font_01_sfnt_off0001051d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 10380 bytes
SHA-256: 712c87f507545fa2a378b439912de883a6b332d459a3bb742373ebeba867627d
font_02_sfnt_off00011c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1