Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a35a64df495479…

MALICIOUS

PDF

104.1 KB Created: 2021-07-05 20:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 80edabcfdc27db27c11e4870deb86fab SHA-1: 6938accd45af7ee1832d5057364d23a7a5505bf9 SHA-256: 41a35a64df495479c4e2354c4e6aa463a3b4281e0de2cdde4144bb4db26a7554
156 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely intended to redirect users to malicious content or phishing pages. The document's structure and the nature of the URLs suggest an attempt to lure victims through a compromised attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://medvor.ru/uplcv?utm_term=m%26l+partners+in+time PDF link annotation
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098337c243b9---zaranerifabovatifiweruxo.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/d010e2c20e4b39975767896df3672657/bufel.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607625287e5bf---95410442567.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/99379653923.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160801bd58e60b---43063697319.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/16f85f8e5d56b816a8ede701db27486b/44994976216.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/kofebimadewinojokiv.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac10a775d---73818315103.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2da3e776b7a581037e692a46988dec78/64152143489.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/27531254806.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/90207255274.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/94175887042.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/vuzemivebefopa.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/61314098905.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/g7tkl31h1r5t8l57h5mhrsde34/pujefagelixetuxopomexo.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/f6559ef0f2a9153d862a5612f5ec8224/21508845611.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/kiwutiriki.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607561ee037ef---fitivewazijirari.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/43729473003.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/lo9jgus8mn9pe7fos3lov2mj1m/49724257085.pdfIn PDF document text
    • http://soupworld.de/upload/file/suzogajunafuxufan.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/95okuh1m2a0881n4je4dmntb31/83039181146.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/75046761775.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001111d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111D 17420 bytes
SHA-256: 6eb07319dbab72e398931d94f0ce97e015d9d572c52a30774c6075818fd05440
font_01_sfnt_off00012ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA6 24192 bytes
SHA-256: 6bdc976d0045b929b0a4925b35ba623651b50b17063d022951e9346d3d804072
font_02_sfnt_off00016860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16860 9068 bytes
SHA-256: 0c5dc90c3de47cffa0504e1bb228b014d25b31b00ac4265d3cd1e9712d82adbe
font_03_sfnt_off00017af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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