Malicious PDF — malware analysis report

Static analysis result for SHA-256 1762aa42f2e48d44…

MALICIOUS

PDF

68.4 KB Created: 2021-05-18 03:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbc592df5c9b848fd034d5649e2a893f SHA-1: ddc10614c724c27b990b6989d1ec357c0b018289 SHA-256: 1762aa42f2e48d44276feff0c6d65d6ca9bb83795c6d79114ba7d8e981f7420f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm used to distribute malicious content. The document body, though heavily obfuscated, contains text related to 'free robux sans verification humaine', a common lure for phishing scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8336

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd6741e5b6---93799711481.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8779edb8---zokazuvoki.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/c97b52f688161ab2614e91b065acb11c/94683779813.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081026b638c7---47201578508.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/5e17bf2e14a37825139f2bd16ebb4bbd/78558975406.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076628e7d74e---demakoxivalufovupipovo.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/96a59f010a2ed05e505d053fc71285a4/34085591271.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0c666dbd4---fijovasovoxokuxefaf.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092f05cac6de---41835816498.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/432be47355958460d4e507f0616a0c25/19906826404.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/gcqj9ckrcr5r1pra7adqrg3nnf/dovivenob.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/9115c4fcb25b8802ee2fd27c4d52323c/48710312649.pdf
    • https://aronabritcan.com/userfiles/file/49057415786.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca75f7e516---valanovuxidexasukefeva.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/c13e1ebe508dfae6fd6953054e17287c/38034541192.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f12f49e279---zopolekegigeke.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/f27bcb5ce75689ca63f0a8e7fb96d608/10341143555.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=free+robux+sans+verification+humaine
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e26a.bin
d48451b48b22b7f8950f406e245c1ac1a0e640d78c69e20e6cb2058ea44c3872		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE26A 5312 bytes

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