Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6c870ba3adccc4…

MALICIOUS

PDF

88.5 KB Created: 2021-08-14 21:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: be3c5f962c9aae778d22e3d68f374f4f SHA-1: 4991516ee0f0703fd7bce4c2bb8e82c4db3a99bb SHA-256: af6c870ba3adccc4319a0273324dffb117a6f396d6e034f86b03194c7570ddd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of external URIs and link farm heuristics indicates a likely spearphishing attachment used to distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c730bdafa99a9bbb7ff7d48e01cb1216/83151835666.pdf In PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/4d81fb1f3325d2c4655e3ac2cf61351a/98843589605.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/51489856743.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075fc7d8f58f---xokikosobo.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/wivivaxusuludozuvup.pdfIn PDF document text
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/58140654940.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/99kl1adgk4fnhf2ipi3eu1sseg/papini.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/a47u9nalkk34mtcl51h6f9gjq5/57012903697.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/37006645688.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52784709234.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1c359e7e8---28037578595.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c66abc5aac---besowaw.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/14446194623.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97d8f1862f---84626296206.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/7916073281.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/ruguwititobimobugidivakox.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/36505071853.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/gaberivodusotupafovageve.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808194c9341---govomokafen.pdfIn PDF document text
    • http://richfield1960.com/clients/865265/File/nixuvedimazadulosotug.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/80f033f5de4fdcc341f6da795bf9e473/60759444099.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/6afu9h8lcbhbmujq13l3m57or7/safavotadipe.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744199f1dc5---rodubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=fast+and+furious+1+full+movie+free+download+480pPDF 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_off0000f2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FF 17488 bytes
SHA-256: 2b70c3a5faf2bf4c88ae7042ec1c065dbcfdf85718e63262891b35787389c801
font_01_sfnt_off000120ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AB 11348 bytes
SHA-256: ba3fc6584f7a65ffaa97c63785b3663e9279293f656668ef781a28f52b360c0e
font_02_sfnt_off00013b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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