Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e106b8f4a321a0f…

MALICIOUS

PDF

70.3 KB Created: 2021-08-27 21:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 196dfa560b062a1b7ee2034142ef3f12 SHA-1: 0eaca377ab0e4a636e51e0101f5f44c3ed57ef8c SHA-256: 4e106b8f4a321a0f35fe120477986133af11f42d2a7fc24884807e69e57509b7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to other PDFs hosted on compromised websites, a common tactic for phishing or distributing further malware. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The structure suggests a link farm designed to obscure the ultimate destination and potentially evade basic detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5455

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://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1bdf96169---61861584115.pdf In PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/69385a370906cba793250fc92974c122/ribovoroxijo.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/zenapuletexo.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/75232509515.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/73d71d209b57e91cab94440fac61105a/rimejejorodukog.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/saterawonifezirejonavedo.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/l7mplni708bkh8b6gijaarpra6/zevud.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/44458965147.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/wekeborimawa.pdfIn PDF document text
    • http://dahchen.tw/userfiles/files/9410593312.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/jotawazolamoze.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/99eecbfc4ff88f9976bd17fb31722029/59908137160.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/73d75d6a842f5586e7bdbcd4d306a057/57487944617.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4afe6a5b6---tizapa.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/rufikewa.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/72808348578.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/lugimowoxiwifoxefa.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/kowegejuxok.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/voporomupovexixusitujatu.pdfIn PDF document text
    • http://imaginove.eu/data/Files/bibasokasovumu.pdfIn PDF document text
    • https://fivetc.net/uploads/files/gusizixaze.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/1899785621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ids+hotel+software+manualPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B4 16640 bytes
SHA-256: eeb0e0d96f4a0902527d7368681bc4955e1aec0c901f7c418c7c28ddd765c2fc
font_01_sfnt_off00010010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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