Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37be7e2a91c1f09…

MALICIOUS

PDF

70.3 KB Created: 2021-09-23 22:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5021b1f8f59aad3d10034ea59ce04666 SHA-1: 3f01d23158d21bfb1a83bbfb9c229e37e374e2ab SHA-256: b37be7e2a91c1f09cba1b0446bd57bbfb23e2b2de550669ecefd73d53d171465
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6611

Heuristics 5

  • 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
  • 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://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161432217d8122---58836710384.pdf In PDF document text
    • https://mysmartedu.com/uploadimages/files/vidugufevipomusurilegit.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161480dc1154da---24752730272.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/fuvadezadexiputorix.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/39937455677.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/sipakujavivawi.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/jivagepiguvifuj.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/38450032090.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614807cf68c91---59627962049.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/44574579517.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/fedijovesukepovuxuvadafoj.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e6cfa9aa2---woviwadakuluvejunasaxok.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/77129605245.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/79740142986.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/zifoxikitawuzuvami.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/fagamididudel.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/zozawiva.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/firidawuwez.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/44544676670.pdfIn PDF document text
    • https://gameclub.by/uploads/files/92118482862.pdfIn PDF document text
    • http://shopabrang.com/images/files/fejos.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/jepavijirukigigon.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/124110228.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/sives.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=format+sd+card+in+mobilePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F7 18920 bytes
SHA-256: 5981b34ab97d5d74e81bbef1c1147489766fcb7a455e2a11c13b4cbdd8bb7f4c

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