Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd99d0abe8335bfe…

MALICIOUS

PDF

74.7 KB Created: 2021-09-02 06:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd5a484f5ec0e7b2df6fbab9a5fb4538 SHA-1: d22702159004250be3fbd61e8092dc416c73fc18 SHA-256: bd99d0abe8335bfe693e65f74f8126c39cdecf4fd91143c8e4553aae3b1ae855
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream, which is a common technique for delivering malicious content or redirecting users to malicious websites. Several heuristics indicate the presence of link farms and compromised CMS uploads, suggesting the PDF is part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://numismatika-nbkpdy.cz/userfiles/file/77643574203.pdf In PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086f699bc708---sibivujudimanumivaf.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/gurakobifojafaruve.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/nuxafipamewazebelazu.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/fusufefamitebaparimabo.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/vidifubejifaxupekominikor.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099aa3e2b0b2---12774040351.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/67392854145.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/fd018ed99a798a96da76a4272a5aa3f7/51684673743.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/127322720.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/370313958.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/48920000838.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/sojinura.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/dikujasibanevapeguzelamut.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/78015761622.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093255d3382b---rademogu.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0115b2d74---8614496272.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/fimununuxoruman.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/44dff0c56c0ddddbd37acdb067e1d8ba/vipopogaxonutip.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/81928612143.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/797784cabead59f1467a9689749d7749/lonajabinokonufisek.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/ddc730691de2bc010ff8baf5161d49cc/83226189148.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/xerisojitewusepenegesoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=all+equilateral+triangle+arePDF 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_off0000c080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD897 10220 bytes
SHA-256: bf652b08fd03d9033f169bb22c85cc5e0b3080ebf2c9481d43132dcf227efc02
font_02_sfnt_off0000ef45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF45 17644 bytes
SHA-256: d11928b3ec6bbaed6bbbfbad594bc58f78deabe1f44353ec2a6357d96f1fdde2

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