Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b13457325a3443e…

MALICIOUS

PDF

91.4 KB Created: 2021-07-25 23:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 76d41738cb746ca23690c7c8dbfd8d78 SHA-1: dc6ba2f8f88941c68e7ed9d78ed4cb12dd999b12 SHA-256: 0b13457325a3443e24ae8056f80526d69bf94f5be6af1a471a7121efc0c36f18
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites. These linked PDFs are likely designed to lure users into downloading further malicious content or engaging in phishing activities.

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 http://acquadiqualita.it/ckfinder/userfiles/files/jawelopiwomadaxafizufuj.pdf In PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de5e3db489d---zepunobenupoma.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/30850a657cd74996c8a1eaeee9efdede/55566794577.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/c3kacp45tbh9vbj31asnbh8ugt/sovivijiniluxede.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/1367321674.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/88471495298.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/41462689372.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a1701bc373c72a3fe261bb83849dea24/80821846940.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/vovunofupamojuri.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/pager.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607575759d1f6---50255736581.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5770ca5f3---kuropexazivisusu.pdfIn PDF document text
    • http://righetti1970.com/clients/872956/File/susowesoxagotili.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ddb251500e5b94dcdc0080a6222d77ac/22321461650.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/risilezede.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/roxeletokiso.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/f8464519719f2972b340a4efac58d42d/30812386482.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/7aef789a4b66580c8f7c94944403d6c2/sawolizubuselasinopajuriz.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/32c3a4c58795788aabf293d202324d99/38239796620.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/kepasufafenezuzanip.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/gulemerevi.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/ddee0d0859924d4062e36198bb8415c4/zenapakogigetatoj.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/v5r399m4970hnvs519ccpt9nca/87450925026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what+are+some+examples+of+personal+skillsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off00010176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10176 10812 bytes
SHA-256: 8e674d743d20340d0c2a2767e118a61a38ecf2bae20c0797bf916e525a40aa63
font_01_sfnt_off00011a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3C 16968 bytes
SHA-256: 6be8ad28670e4ca00533fb8bcb6ae68a9594e98ce9e758ef9fd6b7843475b5a4
font_02_sfnt_off00014684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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