Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b567c8574da1af…

MALICIOUS

PDF

83.0 KB Created: 2021-07-06 08:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 0a5f87872f95a14099b3949435104138 SHA-1: ced9f406dd0e56746f2d90ef066bd2bb063c338d SHA-256: a8b567c8574da1af54df1d59bcfcb4d002b09378927b62b5b072dc53209c611e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier clean score 0.2404

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://chupanhnoithat.vn/upload/files/dufatuxovotatovawezujivef.pdf In PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6e1cbdb75---73868029132.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856ef229db2---65766064038.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/36723327694.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3809249f54---15679191082.pdfIn PDF document text
    • https://koratspring.com/upload/file/33594869570.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/c30cd503aad9d252a3dfd7f2c1797b4c/31392787419.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608155f06c8c1---75734955825.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/47eb90008678af16f127d5e62fde1bc3/xemubonukewawisisepugex.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/legitopadodemuzagakog.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/m5at80l6miavkhjc707qahh4kk/reruvina.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/mapeguwaxofedabukis.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/losajoxor.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098979c91da8---59734785919.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/i5hfpok0j0aprp00rprqf2bat2/39674183634.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/3858e7cc50ebde96c6dbb425f7be0921/2305468124.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/142d6f84d8eb1836413fd14bfd454dc7/wedogafelufali.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad63268403---fupifupod.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf9591cf99---degagalemalufotome.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca78d626e3---54331369884.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/78391875229.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d72376551---57625782249.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/takixazaboderozat.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/24463751635.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/30946394604.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/wukixolawixosej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+do+cows+fart+outPDF link annotation
    • 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_off0000f18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001099f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099F 17752 bytes
SHA-256: b1b8902cfeaf599732c4ad6c96d53495299a712838229377f6d81df7721d68bb
font_02_sfnt_off00013845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13845 10380 bytes
SHA-256: 4a18a6fb27fdf1d8bd03acd768f5c92f2bb1951c0c9e6fe26ebbdbf8f97ce1f6

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