Malicious PDF — malware analysis report

Static analysis result for SHA-256 92109f8d34bec17e…

MALICIOUS

PDF

70.8 KB Created: 2021-10-04 01:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9006e9834f884d88670de7cdbdeec9df SHA-1: 65951749e4494a2a0637bbc9d78437a2876b4238 SHA-256: 92109f8d34bec17e5f3107409d8cf4fad4bb64e46cd72ed3203b3e6e1f9e577f
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bet-balance.com/userfiles/file/35592713998.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615891374b9fd---85158804116.pdf
    • https://shreenatharcade.com/userfiles/file/11246593405.pdf
    • http://amexeuro.com/an3_Uploads/file/pavubusakinanuwovuv.pdf
    • http://maremio.ru/admin/ckfinder/userfiles/files/rilajovafazatuxewusidemum.pdf
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/virikesemavomamu.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/0732a61503518bc5c882b53fca23c9bc/bupisomoposujivino.pdf
    • http://www.smartusb.info/images/library/File/kobimobulewadeso.pdf
    • http://condosworld.com/abisol1/userfiles/files/gidolitawononel.pdf
    • http://stluciachamber.org/uploadedImages/contentImg/file/lanisebezopozutizo.pdf
    • http://suamayphotocopy.net/userfiles/file/70481397141.pdf
    • http://pscemetery.com/userfiles/file/zivufevogovodokaxibobewe.pdf
    • http://abarappresentanze.it/userfiles/files/ledamurusupade.pdf
    • https://camping-du-lac-dijon.com/userfiles/fichiers/jogixewival.pdf
    • http://space-edge.com/upload/files/14514650539.pdf
    • http://saint-party.com/media/file/6074651285.pdf
    • http://artin-intranet.com/ckupload/files/86151777393.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615671e5f2a2d---98831711413.pdf
    • https://sproname.com/files/userfiles/files/ladebavoxabovidabakunidi.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425675a1d69---48458551174.pdf
    • http://www.guus.edu.mn/ckfinder/userfiles/files/zimodavevu.pdf
    • http://ei-windykacja.pl/upload/file/wuvumerofokopogukexepi.pdf
    • http://muasamhangmy.com/ckfinder/userfiles/files/12468139778.pdf
    • http://ganteltechnology.com/system/userfiles/file/xurarofebirokeriligugedif.pdf
    • https://detectagsafety.com/ckfinder/userfiles/files/72213360405.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=mcqs+for+pst+nts+test+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2ac.bin
3815867ddfd21a8015ca7d28b0b74299c82531704a4f30197a65334a0826ad45
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AC 16936 bytes
font_01_sfnt_off0000de0e.bin
83d371ec19122145445745ed15df51166747d26cf134141bacddef9412962895
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0E 10452 bytes
font_02_sfnt_off0000f5b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B0 16792 bytes