Malicious PDF — malware analysis report

Static analysis result for SHA-256 b845cefa919ccc02…

MALICIOUS

PDF

83.8 KB Created: 2021-07-25 17:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7785418cdee0542ac034b01ccb3c8071 SHA-1: e4ea418cf765f2a6c68173e3816a93b961670855 SHA-256: b845cefa919ccc027181186d09559d09da49ce77a1c79f8f72ff01ee74907262
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to potentially compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of numerous external links, including one to a compromised WordPress upload, indicates the PDF is likely used to redirect users to malicious sites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://10glazsikeyrosa.ru/file/15815383516.pdf In PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/af59c5766d83fd80dafc8cc31fcbdc69/99688517549.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/pejogazapofulasibidakopor.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/gegopoboduja.pdfIn PDF document text
    • http://shs67classreunion.com/clients/b/bf/bf9552935413f2527bbee995f2dfc9b5/File/jagogemuva.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/vavabum.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078d3d3db86f---rakuzeritavubun.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c41d932cb---32516809813.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af2beba79ed---8797357367.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6998e334c3---15705693125.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/97809003999.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/35783369062.pdfIn PDF document text
    • http://sport-way.ru/img/file/57278742659.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/jogigod.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/bugigitorewo.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/nedafiselemuzitedimura.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/terokudig.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/tarur.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/vivozibalel.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/0730ee46a81836123802cf40739f14c3/lutifigebizumali.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/belewosubazoxin.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/23958630928.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/97684620679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=new+bengali+film+song+downloadPDF 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_off0000e5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 10704 bytes
SHA-256: e6cafc513842b35c08453b404688478872c49c4fef55513d8187e2e1e933a523
font_01_sfnt_off0000fe1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1C 16572 bytes
SHA-256: 49817de14e9af2dfc89036efc74559e31cc8411edcb34b0346e1a2e1487b9831
font_02_sfnt_off0001296c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1