Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b13b8f4b493ed1…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 15:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2eb692f00c2f2eeefdb88926c13cc074 SHA-1: cb33e26e598f9f251e9c69fd579ad4ce8020a0cd SHA-256: a0b13b8f4b493ed1e582499c9033db771b1bce14e8429ececdcd072257085a55
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 are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery through these redirects. The embedded JavaScript may be used to further obfuscate the redirection process or execute malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://krisoc.ru/uplcv?utm_term=shallow+piano+sheet+free+pdf PDF link annotation
    • http://kzlo.pl/fotki/fotki/file/vimepodebijidi.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd1a5499f6---zusedag.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/dutikorub.pdfIn PDF document text
    • https://latework.cz/soubory/69035228937.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/98439228577.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/c38dd89c3c7f73d7ca50c37a0d12acf0/tilesina.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/86f6495a6829debb074934030012825f/83474190272.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/fedijofosawebaberu.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/30450648625.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609609fd119ae---5052774609.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210523191617947.pdfIn PDF document text
    • https://ptogel2.com/contents//files/sekesiridawesujexaw.pdfIn PDF document text
    • https://soechi.com/userfiles/file/77079934472.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/rafozifewufemisiwopo.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16072d06743af8---jizotoxi.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071813f4a17c---23420735201.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/219569385500cdc813cefc95ae16eb08/siwukofaripu.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44195699921.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b43e465462595bf8d15b24dafacb2d46/4611476069.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/gokolivumoxanop.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160820b1c76045---91518707948.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/29677141863.pdfIn PDF document text
    • http://carszana.com/image/upload/File/rexobolexu.pdfIn PDF document text
    • http://freeski.hu/freeski/file/63045057394.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/637fdfb73bdc457faae1811fba164061/67631341093.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f78261dc64a86b4b3da78e0067e5d38e/xobegubixa.pdfIn PDF document text
    • http://howsonfamilyreunion.com/clients/5/57/57b8fe7d350e782a16e6afc8bdcd6467/File/25155318588.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb9383eac7---30517136560.pdfIn PDF document text
    • 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_off0000da81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA81 10756 bytes
SHA-256: 670393095a6e05f92dc53803c509773e656de8c4add3d26d1b8250b95bf26441
font_01_sfnt_off0000f33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33C 17764 bytes
SHA-256: 9a441894994c004899c7458f95ec8ef0805d4836335da89a786da4096230bbcb
font_02_sfnt_off000120bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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