Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a764c4d2d682f3…

MALICIOUS

PDF

85.3 KB Created: 2021-06-28 13:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a0d1b6415d1cb456e77eb8d0f037ba5a SHA-1: 0992f08a7fa66c9958c47b6a8d4e371d890e20e1 SHA-256: 97a764c4d2d682f32d5af7696ef067da2717e6f35c001686e6d6bbc3738b9f72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to numerous URLs hosted on potentially compromised websites, including WordPress installations. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest an attempt to manipulate search engine results or distribute malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=who+invented+the+steel+process PDF link annotation
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16094c41ca6fb3---xugeborogunilorivu.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/tuvafosojikezamuwegotaket.pdfIn PDF document text
    • http://garderoba.sk/images/_file/gemuporuwir.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/tupilerulenatojixuz.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/5063222218.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160724393720a5---fosimu.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/2f2f51743b4c4935cbe0136c7821f0fb/68479605556.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/piwegaleputigazi.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/3ddf5ad8e9c2b20294641389db3bfd15/wazera.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c1c3445d9---gakubovinigejesisirapa.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/004b58d1ae5c3cdf01701ca3df9c7d8c/zivavawujodudi.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b59d6a96f04---xipovixipeja.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/46194533078.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e2da2478c---4474578073.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16082e2ca679ca---dejegufobodasunap.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/vezez.pdfIn PDF document text
    • http://hasyo.net/files/file/72612529882.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/nekipudad.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/60109373c37460a7c8339e43b1a3dca0/xedixeduzajiso.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/3ee0e2c16ed18f48cd567fe3ec370efd/kadenu.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/48603215625.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/625b283f1d76404d07a4d41931431342/48994297729.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/671be5cc270cdd733c9d7de8ff3d856d/gaxexakaniw.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_off0000ec74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC74 10508 bytes
SHA-256: 820e6076eb0709a2dd68044f8680c2076ad3cf7268f8d87f3569830e42671d31
font_01_sfnt_off00010457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C69 16840 bytes
SHA-256: 44fdd5f69629bea44985dcb07d9d44483e453db2cbebc6c31f804038bebd5e70

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