Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b0d344d133f9ac…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 00:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d24fd585e7072a7b1793e56c249b068d SHA-1: 8f9a5b98ccb6fbf82af34e13242427f579c44a09 SHA-256: 65b0d344d133f9ac7a9fc2f99bb95408d4c880c192783196aa7fd96a0d157bad
164 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to numerous URLs, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://medvor.ru/uplcv?utm_term=manuale+suunto+d6i+novo PDF link annotation
    • https://mai-avto.ru/upload_files/file/xonasilodoneriti.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609da4355fa32---1752405976.pdfIn PDF document text
    • https://seger.cz/userfiles/file/29077769443.pdfIn PDF document text
    • http://jaatkinson.com/userimages/20343783197.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/nenafemesijefatutagono.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a78bb104d---89422955216.pdfIn PDF document text
    • http://unseretochter.com/images/file/37784046868.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/82287401463.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d534abcfd4---tikabunijipezimanewuk.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/2dc85108312e7b775282b74087e2138f/98232980099.pdfIn PDF document text
    • https://assistenza-termica.it/file/24947499367.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/bcf1e0c95c51ad80b1505d7e4bd31f61/13863943190.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/37112923741.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/vurubadozusidijotesin.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b19663eb3a4---5423032098.pdfIn PDF document text
    • http://skupka54.ru/upload/m/75615137597.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/sabeke.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/21613632657.pdfIn PDF document text
    • http://supporttmes.com/clients/2/26/2647aeee05d38019bb2ff7af4ee9f9d5/File/funubekofejemixaku.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/80699926760.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/dudunude.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a80df8056a5---temukigezawifima.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/tekovitotexafirez.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/45304816628.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/tuvuveketelotite.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ded590ec3---1218007783.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_off0000ddbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBE 10468 bytes
SHA-256: dd32b7baa48268a5ded27325b0f713f8b18eb304e8732f77506031e48f424015
font_01_sfnt_off0000f5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 17872 bytes
SHA-256: 66d4141de8d66d9cd170cd0db8f0e4afdb657c56b08d7f5f436f948df53c5392
font_02_sfnt_off000123df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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