Malicious PDF — malware analysis report

Static analysis result for SHA-256 952af9c9b0de9710…

MALICIOUS

PDF

87.2 KB Created: 2021-09-15 09:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 545e2b8645557deb4ae7111fa5788615 SHA-1: 66b05f5333856904017cd6ad3ecac5b2cfbeb5a5 SHA-256: 952af9c9b0de971063602d116f72c849c0c526dd5494daf304632504dcd83b8e
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites to host or link to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=where+can+i+watch+commando+3 PDF link annotation
    • http://isvpro.com/custom/files/beranupumewoma.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/83769f39162882f663cd9a11f495efc9/dumidufimigisupoxub.pdfIn PDF document text
    • http://ihdbd.org/upload/files/bunafigudi.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/52231646098.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/24915969640.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/67429541445.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/wisetilexosegagunitotel.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/43f8a8f7ae1a2aa4861a8fd5e27a285c/dibinofiwuzi.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/11416001089.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/93946375513.pdfIn PDF document text
    • http://htygroup.com/upload/files/677469636.pdfIn PDF document text
    • https://quizai.com/uploads/files/noxafudeleboduzubakuba.pdfIn PDF document text
    • https://soechi.com/userfiles/file/ratux.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/xivezazi.pdfIn PDF document text
    • http://foxadv.net/file/175904415.pdfIn PDF document text
    • https://duel.pl/userfiles/file/gukabalewufa.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c8104dd50b7f4708084d0858bb2af1ef/mewituzede.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134ab34ce5a0---rubegimagojefubimofowo.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/vukazudonazurize.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/goxepinavonowidu.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/36588557017.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fef4b5335---43361627818.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/lazewibitusupemo.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1d8671dfa---76085033290.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/91257954290.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_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 18888 bytes
SHA-256: 258737aa0675c974977c408d36431e93e84549b343d3312bfbc995f83b41edfa
font_01_sfnt_off00011eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB8 10672 bytes
SHA-256: cee9716d29a3df740d7a3164ffa5371c43b1f5c1a43449cc7448f7da21b8325e
font_02_sfnt_off0001371f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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