Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f8c82249e45eee…

MALICIOUS

PDF

100.1 KB Created: 2021-09-04 09:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eb0e928bc841b2d97017d8957bcc35a9 SHA-1: 5a1000906a3b20be1f231a36e0f2cb03d5203efa SHA-256: a8f8c82249e45eee885089ef7e785a3fc74d0afadfd53a5f3b46245195020522
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external resources. Several of these URLs are hosted on compromised Content Management System (CMS) upload directories, indicating a potential distribution or hosting mechanism for malicious content.

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://dovolena-jiznicechy.cz/uploads/rakabo.pdf In PDF document text
    • http://sadiqandsons.com/userfiles/files/75868002371.pdfIn PDF document text
    • http://talleresjpg.es/img/file/bimelubupera.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/84591998926.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/dc0b8361c310f333b2a538b9ef233e06/vumagujej.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/buluwamobulojedijezaluno.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/11592295040.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/11850660016105d5c0cf961.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/28211992805.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/5efl65kkpnmbqf2pmh9s8l1d35/58178209909.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf91d7efec0---wukuxowukuvaveboxomu.pdfIn PDF document text
    • http://kasargod.net/uploads/file/10949514442.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/tosovixuxowisoso.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609629541599a---55076484017.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/35129392189.pdfIn PDF document text
    • https://iranjobex.com/cache/fck_files/file/fimidijowigovasesokaz.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/95086711383.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/afeic7m2a04j1p6c8m5cbci674/lufamufavof.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/659351203.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210714043148806.pdfIn PDF document text
    • https://turismoporsantander.com/aym_image/files/70069367043.pdfIn PDF document text
    • https://ka-base.no/images_students/files/jolukaxalap.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/8362face6ed5c9f9c7da4d0be121163d/badopomorenabufeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=grass+cutting+machine+manualPDF 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_off00012760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F72 16596 bytes
SHA-256: 2a30a80ed317a6d71015c7b3c1750d6c6e8c0ca5cea0f452f530694500d9e7e5
font_02_sfnt_off00016a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A27 10696 bytes
SHA-256: df9ce1906dde1caf5fa5ab711424e120d7fd7c9458e1c324d35542411de57e80

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