Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ddf3334ae6accfe…

MALICIOUS

PDF

83.0 KB Created: 2021-09-20 20:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b3fbcca1f37659fff5365678664bd13f SHA-1: 421f511e03bad7f34d0f6c4c54b68cbbea18d3a3 SHA-256: 8ddf3334ae6accfe81be1bee848b78b5b6abeb5f5861442d90d11fcc0185285e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external URLs embedded within the document, including those hosted on compromised CMS uploads and disposable domains, strongly suggest a phishing or malware distribution campaign. The file's structure and the presence of external links indicate it is likely used as a lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=android+anrufweiterleitung+einstellen PDF link annotation
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/27497395046.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/77061014292.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/nexoj.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/zutojemusitipimiwelawutis.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/55627391724.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcd9c673c3---60394503369.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/badibuxivugozufifezibotu.pdfIn PDF document text
    • http://aa-nusd.jp/44622450060.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/74046551162.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/lavunogatepemuteseja.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/tatiwidedirovirinubelareg.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/46588329429.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/buzamomag.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/73174743938.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/pirogovifefuvewirebef.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e108949072f182e8ec47b9e7d8c27c15/dutalas.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/2852691873.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/tojemebazeg.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/nimiravamiwuvogesami.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/dokemarigu.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/72a65b01dbe2a15d53a34a0d2f9ffee1/49355751160.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161389baf09f4e---jubudavezegodugivuwejuma.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/daterowabekilemixavozuwav.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_off0000dd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD82 19084 bytes
SHA-256: 1ef901ac83deb9f41ad52a2716345e331b654255bf194cb588737df423b3ab73
font_01_sfnt_off00010d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B2 10696 bytes
SHA-256: d09ed5366390a711ad90e433dce081900e81f78d742da9859bf271212d9d4e8e

Open this report in the interactive analyzer, or submit your own file for analysis.