Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb1ec7f545dd2c1…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 06:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: af6c476cb5484cebbdd986dd4e508266 SHA-1: a3b9bb6f3b56e5eb7ced7e19ae32a7f80a7b6619 SHA-256: 2cb1ec7f545dd2c1d3efa79fc39078f125600bea1fd6b82c3e5c669f60c92d2e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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://mvpbuilding.com/userfiles/file/lafugesujisaxife.pdf In PDF document text
    • http://pspectr.ru/userfiles/file/wuvelaxuweb.pdfIn PDF document text
    • https://naves.cz/res/file/14065693687.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/89960291944.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/bazikanarinupazusevubobe.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/95488701979.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335d1ae1b64---55263190463.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/xixax.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bqei93lcn6qbc2ule2bm7kmeb2/xirex.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/140120464863.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/mejuxuxubarebedire.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/nukizuwolinazadibixofepo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e446691fa---17610032387.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/24163725606.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/xonenapiberidubegur.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/junugivavasaka.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/1vmanqsun0fc03nu87er957pv7/56962013740.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/vakisumesedosutet.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/golalarosugamevuzox.pdfIn PDF document text
    • https://noventa.cz/media/files/file/2103314025.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/sesaf.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/90406020359.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/doligopodulibib.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/nuwilovukejisowajaresoben.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/2qnqtesjkll0i4hl0rsoaaejmq/43024017543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=encouraging+words+that+begin+with+iPDF 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_off0000dff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF3 17236 bytes
SHA-256: 69608f02ce749796d554221d3df65f70f6d0c94ea33e0418da1c8ca415ddde65
font_01_sfnt_off00010c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C58 10912 bytes
SHA-256: 1accd484ec17a3818a98217ff06d9f61b556fde9bc9f777effb0b7f109911169
font_02_sfnt_off00012570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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