Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db76bb4cc73d9f2…

MALICIOUS

PDF

74.0 KB Created: 2021-09-05 10:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f29a38ae5f23702954ee3c69e117fa43 SHA-1: 40fe8a1f3a3f740033d5151d22e40bb435b557e2 SHA-256: 2db76bb4cc73d9f23507e805bb93d89509d692a849c3b08d27ee764622177c86
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The file's structure and content indicate an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://biodent.ro/m4fm_files/m4news/ck-uploads-files/zedawo.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/wumizafitofivazolezote.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/799e1ucv6s6v5bb1hgv8873nsg/13212551963.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/44946059534.pdf
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/valetagoduzulewanale.pdf
    • http://mobydick-band.de/fckdata/file/tuxeliraxurufumof.pdf
    • http://redondoclassicburger.com/uploads/files/sutelidiwimo.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612ca21b11697---jidesadexifu.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787240a0982---19339292893.pdf
    • http://hungbuloon.com/media/ftp/file/serebonipaxemopajozi.pdf
    • https://balajitutorial.com/admin/userfiles/file/nejuzutotezo.pdf
    • http://club-integra.ru/userfiles/file/pejuwexila.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/37f44146ff877e5175f258195a837b89/52901712555.pdf
    • https://bank-kredit.at/ckfinder/userfiles/files/susisofupakabax.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b6285d16f29---texuzapum.pdf
    • https://laps.pl/userfiles/file/xifuxos.pdf
    • http://alfonsoguiggiarchitetto.it/userfiles/files/sarelisufu.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dbaa788d9e4---88328450393.pdf
    • http://asu78.ru/userfiles/file/84360037902.pdf
    • http://dentalclinicbangalore.com/uploads/lusujenolapevuwojoparag.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781d0fd00c5---4610399352.pdf
    • http://steakclubhn.com/campannas/file/wurawomapujanopogoj.pdf
    • http://drapa-technika.cz/UserFiles/File/fowulutazobe.pdf
    • https://akconta.com/uploads/files/18591409885.pdf
    • http://holidayinntorino.com/userfiles/files/13621392244.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=10+functions+of+the+liver+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_off0000bf3e.bin
791c6ef5b185c2cefab2171296a271ad6e8092ed556d5758de535a3f75a5717c
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3E 10796 bytes
font_01_sfnt_off0000d814.bin
34153b8e0d02c59d0024c10362577e040b8b2faac695963aa9629d70e318dccf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD814 16476 bytes
font_02_sfnt_off00010208.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10208 16792 bytes