Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8db2bfd51bdc1d4…

MALICIOUS

PDF

77.3 KB Created: 2021-09-05 07:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d21a9e7ac0fe69d8e86a9032061ad3f2 SHA-1: 2864244c4f2e63523837a4bcc3085ba79b9e17b7 SHA-256: a8db2bfd51bdc1d40e817efa731c35f919a2ccfedd00d3d62f32977d0a1db0de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous other PDF files hosted on compromised websites, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://pedraferro.com/files/files/47607016563.pdf In PDF document text
    • http://ticketsperiodico.com/galeria/files/49516849805.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/figuveregofivedijonezoz.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/n0hd0i3a51n9n33g28s92qtin1/wepogoraxakuzali.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/kesatudude.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/29777263577.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/11782093831.pdfIn PDF document text
    • https://schmitz.cz/res/file/25154591758.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/98924933122.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/q89bogej62bi6917rj3j7d5898/winexilokuworofesudomuf.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/zanenonibomarizaxata.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/13160016193.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/kexiwikowolirumizajaf.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5188858b85---gixipoxirilaneritokep.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/35067460756.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///nunazaxusekemixijopixaf.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/jikogakubakuwusaxagup.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/siniwalutedekagalikosowur.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/69560165113.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/famavolofemokagedubuni.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/90361850674.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/f536pfajtik7r4u8rf1lpmjf3u/joxisovamofonebajufavebud.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a3b138354---29515345227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=venir+de+worksheetPDF 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_off0000c7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C0 18804 bytes
SHA-256: 63dbab0c10bacb3dfdc03e94c564ffa70e65aa10e5c1f18d33b89677402eb852
font_01_sfnt_off0000f904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF904 10284 bytes
SHA-256: cace3d7c6f28b8b19fdb401dc4b79c4443297b20c7785ede23675185b0c4c3d9
font_02_sfnt_off00011032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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