Malicious PDF — malware analysis report

Static analysis result for SHA-256 68763807d9408105…

MALICIOUS

PDF

97.4 KB Created: 2021-06-27 07:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1ff823d6f0a6a54ad132fe70a0f6a061 SHA-1: abf4befb50051d917e587501c9e39202ff405bd1 SHA-256: 68763807d9408105e0e2828228ac44cdcfaef85fb2fb8a51de076bc3b368db7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://inimtrento.it/userfiles/files/dunuligepak.pdf In PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/33aa0fb1db233725568b4c8e2be3d1f0/bavanilux.pdfIn PDF document text
    • http://islandpointfl.com/userimages/lofovojuruvagum.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb99cbee7a7---49967072354.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/sarexukalono.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/winaj.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/41460226456.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608406cb27a81---rimef.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/f40c530ec6fd2032a6fa6fcf0b83d586/48359829853.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fa36e025c---64671551958.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/0b63d46c3e986e4fc8208fe714e33951/14917244132.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/b89b0c68e6c46ae1a018f6a44ebeba7f/ropeniwibonula.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/10230daca0b1eea902e7f585735e4f15/6237560828.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607085200668e---33436823903.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/39993004754.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4a4f737a0---55442828790.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/p8gmm4sqtmht4kqhmpsg9s6dc7/mujubulufobujubal.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ac12b8ba9---82455259256.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/xoduzofumagorafinur.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/395b2751e2e16302064999f0ca0aeda8/gedogofetidebutat.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1af9bf1a4---69430255236.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/7689963814.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bca9abbecee---97639927986.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/aqjo3r57phnq3q5pno363mfqv2/dinazujaj.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1624160043346997016.pdfIn PDF document text
    • https://wonkingchina.com/d/files/40205472631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=as+a+professionalPDF 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_off00011a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13227 17456 bytes
SHA-256: a2415e8880a7645532fd7ab5ce63a785330b55709ccfc391fade059131b96d4a
font_02_sfnt_off0001601e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1601E 10232 bytes
SHA-256: a13e6bd4f8ea59f919866a08d65595424c81d1c1b07a54d0d0f2445d03aabbca