Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c3efdf4b99ec81…

MALICIOUS

PDF

95.9 KB Created: 2021-09-11 22:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd1180c6711e2d6455d6851cc1e41ebf SHA-1: 831e130d5d445b03a7881b00e90c6dc3d670e77f SHA-256: 20c3efdf4b99ec814769ce897cc3a393c48d0d1151b81f2f0cc79bf9d44a6bf2
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristics indicate it functions as a link farm, pointing to multiple external URLs, some of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://thefarmatarapahoecounty.com/userimages/22500010612.pdf In PDF document text
    • http://elisa5888.com/shopadmin/upload/files/xodisoxupijesise.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///xoneradejenu.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cba6ba688---zoxafu.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/wutujalegivuxisuzonodaxid.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/n2hsm9ibs75chssq9q7oi6e0fi/48187198623.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gadexezegapotulabij.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/sqgevi96uihl7rn7h1sa2ou8n2/litarikopapasevuzakedot.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccf8017636---30268286320.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/kijemimulelal.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/23502252428.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/zokuzupipenetope.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/niselagumepul.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/xasanajafugugefiro.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/23122080994.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/93757606309.pdfIn PDF document text
    • https://airxps.com/userfiles/files/muduxufojal.pdfIn PDF document text
    • https://anfauglir.com/images/file/45972408434.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/rogakug.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/8805191496.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/zokelipodamajitozux.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/17486060903.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/53644546306.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/sewebojetiwigonaluxovele.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/jobenotodugaramevaluje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=arora+parasitology+5th+edition+pdf+downloadPDF 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_off00010d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D57 19332 bytes
SHA-256: db8b02fbbddafab5cf9fe7a150f7e86ace8a03df14a53d742904d923957f2e40
font_01_sfnt_off0001400d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400D 11092 bytes
SHA-256: 21dc69cdfe0d4b48ee1d651b089f60666620d2af417546df874f752e163dfb2b
font_02_sfnt_off000159cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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