Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b31983808e07cd…

MALICIOUS

PDF

74.2 KB Created: 2021-06-22 10:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 22067a9eea00b5c76d812b33d0807b6d SHA-1: 602cf74babee1bf3d77c08fe12759abad32dfff7 SHA-256: 16b31983808e07cdc9be5c66e061451d5c35792a6fd4532e9d7ee71a761ea68c
154 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The embedded content, though largely unreadable, includes references to 'roblox executor 2020', indicating a potential lure for gamers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9282

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://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc99d70f3b---zunatogawinegarija.pdf In PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8126294f---64302990711.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/betidunegim.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608344f2a35a1---21353491232.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/hd5b30n0q0ho41p4r74gnb81s5/mimekajolebowomen.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/6598f62f360e1326c6e24779d8003d1e/vadoxab.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780e5bf3318---bojosegof.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/5c8bbe2bef68b167cdbcff38382785a1/56911749360.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/20804570718.pdfIn PDF document text
    • https://diphong.com/uploads/67661233206.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722ea74759e---birifogikoromub.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/wezofovobosorijip.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ebcf2a1d---bexazuwodore.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/93629157541.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f83590f560---tovumowavijugexadogu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=best+roblox+executor+2020PDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72A 5116 bytes
SHA-256: 628e4cf5ac197ee9b025fa0b6708e97596f52ad61210594053e42e41b78d288b
font_01_sfnt_off000108ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 11456 bytes
SHA-256: 224cd4941c474bfb8ae8f42edb0b4e3282deb621d2c547b040a54447fbdee801

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