Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1c8a0a5cfc215a…

MALICIOUS

PDF

87.1 KB Created: 2021-08-07 02:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b321022574e2eca6a5c76d2cf0e101bb SHA-1: 64c237c402bbca2bf87d553c6cbfdec95b01ed7b SHA-256: df1c8a0a5cfc215ae238a8dc25db2272823bef28133ce7d07287993b20075b00
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the structure and URL targets are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/9dba9dbd8f6ee06bbedb4c0b0a12ab2e/mador.pdf In PDF document text
    • http://duancanhotot.com/upload/files/3372161813.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/pofuveko.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4d163314d---89006046446.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/69439154100.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/4ff74b6d101694a5bfe6b24dd15f66d3/17477258858.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082e9f538bb1---71111677532.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/11861923336.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/418905022.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/luvaseduse.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/41538235753.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/xodevafemaganalakosalaf.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/33052625110.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/sarivurevejesosawos.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28fcf6f7aa---54533205837.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/57328596713.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/90157532725.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/21710691682.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/tonuloropopazivawaja.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd358d7c0a---xegafefibo.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/vemosaki.pdfIn PDF document text
    • https://horticulturenepal.org/userfiles/file/67535947773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=find+unlisted+phone+numbers+free+onlinePDF 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_off0000f0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E7 17140 bytes
SHA-256: 37803d9b4fa4e3f8fca40c94d071afdba3fbf39079dd5d3daf3828d0494dd096
font_01_sfnt_off00011ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDF 10820 bytes
SHA-256: ab339a8544bc4b84e620e5082b6078874f1dc6884da27b6708f3fe901e0b2d84
font_02_sfnt_off00013650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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