Malicious PDF — malware analysis report

Static analysis result for SHA-256 97af3aff2ff61d9e…

MALICIOUS

PDF

83.2 KB Created: 2021-07-05 03:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 831df9880339a16f32749f26658123d1 SHA-1: afcd89e342273d63565585c6e90bb11e6b49304f SHA-256: 97af3aff2ff61d9e1b93945e0986e72fada6f25b222034b6d13918920ee91430
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress sites and potentially disposable hosting, suggesting an attempt to distribute further malware or conduct phishing. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3924

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c1347d63b---30544094460.pdf In PDF document text
    • http://www.anjhimayath.com/upload/file/latit.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/554b46bac9815426580658411725cf29/81242390680.pdfIn PDF document text
    • https://guijek.com/userfiles/file/gonilizop.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/89837403594.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/mikodawo.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/pajadowas.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/ao3ulq9sv469p8m7lhu6cvoikl/xuzodilova.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/08cad9fe5ed673b263a0e88066f7741e/13166873612.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/xusodibelubamedameduxi.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/8kmqcf6ut7ro231h2juunu5kj0/80630434994.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607056c7356ee---luzexosemujusenazizuw.pdfIn PDF document text
    • http://fittbike.hu/files/file/95366978352.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/87d92f954cc513c04859357aa72e1a9d/gezebakujofuludiwi.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/d6fa5384a303f59ba5b9038529a82f5b/zurarikamis.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/84728856534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=an+uncontrolled+outburst+of+anger+and+frustrationPDF 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_off0000ee20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 17344 bytes
SHA-256: 89349b860dc58c93144963b605d5bf226d2c1a9ea484add957abe43c36108895
font_01_sfnt_off00011b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0C 10872 bytes
SHA-256: b33e613f175f1f9f61c425801415bf1ac4b110befc97912ef01ac54a67d07f59
font_02_sfnt_off0001341d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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