Malicious PDF — malware analysis report

Static analysis result for SHA-256 db589ce034678517…

MALICIOUS

PDF

71.5 KB Created: 2021-08-28 22:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 400506b89a008ed4a71f479175d9831d SHA-1: 35d05ae8a00bff3af66b922100ca10dfd8b57317 SHA-256: db589ce0346785176d18e10b76fbef1ce4ba35cec0b88f9bf51ffc0373bcbc80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://santchavarabed.in/ckfinder/userfiles/files/womikerudirazurelowegu.pdf In PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a036050263---paderakabagomujijanawad.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/kazuzameseg.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/79338185053.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608da2c552a69---safegifikomazum.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/98b9a8fd8ebc99d31ecb6de1dc905ba4/zabemofixejaguligul.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/bc8a81cj76qrkbe0knubaaoh14/raxumetexuz.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4300d1863f---tapiwotezowum.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/bubovukato.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/11505259468.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/vif87rugdnn960re48jtr5gssi/sudesemim.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab24af97f66---16404261115.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b828ff86887---detemof.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/lijinolafokez.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ead3802d32865714f58eb8a78c78ff85/52311034305.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f13791a5b6---texaxanufagun.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160875abccd07e---lofuganaregilisobenasika.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/xatilitanifupijuwuduku.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a489ed91b61---madoxoxirovix.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/84774160701.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/21257191740.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/61049f3db5220c2ae086f13bc75870cd/86884858258.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/69599305068.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/54916169326.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/fabataxagowutavekeminutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=air+pollution+project+in+bengali+pdfPDF 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_off0000b770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB770 10976 bytes
SHA-256: 56e7b242e295d9ab39d38a7dcbc759d35c7997fc85a2b554f4ebd3a56894ed2b
font_01_sfnt_off0000d095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A7 15620 bytes
SHA-256: ffc9c648b1970fcf4f306b3bdc64b257601eb2aefeaedcfd3d2f2c99843b2f4f