Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db9db8ccf4c6f47…

MALICIOUS

PDF

80.4 KB Created: 2021-06-26 00:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a5db8d9c8e378e0af796f5d0116c565a SHA-1: b79385857dc3ecc54e2e695ecc4344115a347a22 SHA-256: 6db9db8ccf4c6f47e6dea6a60c78ea0b8b7dae469132a92fa62cb3f05f07cf09
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites. The PDF structure and embedded links suggest an attempt to redirect users to external malicious content, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2915

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 https://catamma.ru/uplcv?utm_term=a+bad+case+of+stripes+summary PDF link annotation
    • http://macautemple.com/userfiles/file/jadoveg.pdfIn PDF document text
    • http://polletnv.be/uploads/files/buvagefuwus.pdfIn PDF document text
    • https://maturana.cl/upload/file/wugifefunusepaz.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/3f4bf57b2a5837710e59f42e783a8780/zofifuwumaguwexekefo.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/2a417761f627afea04dca7ba4095d449/gekixutekuxa.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720178d19d0---86428796149.pdfIn PDF document text
    • http://ekotronic.eu/files/file/risajoninobesewe.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/bunusebesuwofoxunozeter.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983cc093a51---27376229583.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ddd79c910---dofedosogibasiz.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/14208353984.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad9590ceb---sujajusalavij.pdfIn PDF document text
    • https://samowar.ch/upload/file/ropojojew.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b17623d64---14674295277.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c2e456c7b---bepizojep.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ea11ff0786770d02dc68f51bb14fc7b9/19463332046.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/ad7e67d091ae893651eea973835846a1/giremunetobom.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/hntu4a72nhm70naact875cmhea/buluriwo.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c42202c4e85---99711061409.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/5337202bbec7cc86b262213317fc2919/mujiboxobewe.pdfIn PDF document text
    • http://paliukenas.lt/i/File/lasemazi.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-7/20210507081207924986.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/8fvcbbghf1l869t2ack0205cmt/51862817357.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b7519a3ac7f---zurogotidigazidadus.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/95790173145.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/24575678314.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/guwidepetizoxa.pdfIn PDF document text
    • 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_off0000ec3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10456 10968 bytes
SHA-256: 1f96e62e8bab295530af82c899544bc0fd1b2a5d942d297a4c6b0654a274f324
font_02_sfnt_off00011dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAC 17044 bytes
SHA-256: e0784a9de4e31bab59fb98c7503dfc0d78615d9c1609c47f5a9c57110418e413

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