Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57085c2ad3bf883…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 22:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f6d5f2da6c6ee4fb0dd25d7cf92c1276 SHA-1: 424dfa8f24c7a19b1a083b70ab87c805425d6ccf SHA-256: b57085c2ad3bf883349b002e6465951c5972c7a466c545f60be8d396c86349f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content or download further stages. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/vabevepivowuvadulewipuv.pdf In PDF document text
    • http://c2ctrading.org/cms_upload/files/xivujiwiwewifula.pdfIn PDF document text
    • http://ccsl.asia/files/vedotitegifitulojatef.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/99223741741.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16141138c7b38e---53349957313.pdfIn PDF document text
    • https://salwangurugram.com/files/84976475114.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/21911089285.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/d05pavs2i9e3a58pp3i57r53j7/lilodokenuvujemumajom.pdfIn PDF document text
    • http://llux.vn/uploads/files/5803124502.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/giraperutifatutewot.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0889b593c---16081425296.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/jijinupenisafigakumusira.pdfIn PDF document text
    • https://e-midas.ro/files/file/zumisopejujatulodom.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/ralusibijuluwef.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331fd6adcf7---wuxawatevopafapikekijaz.pdfIn PDF document text
    • http://grabnerestriche.at/tolaxaxijipodanewoz.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/73651411151.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/verenakidowizubizo.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/48182421321.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/vulegofiruvebudik.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/91234599498.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/20935255852.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/gewigudu.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631368253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+wlan+automatisch+verbinden+aktivierenPDF 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_off0000d6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A4 19168 bytes
SHA-256: 8c22f80b9ad94105f7bb3621dca6848f3c9bb83ee1a2fa2f28a9c4adb2b04ad1
font_01_sfnt_off00010715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10715 11100 bytes
SHA-256: 14f84c18ad013ee80dbff73182e986890ff7244219387f6203c4207e77629b94
font_02_sfnt_off000120e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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