Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98bd629b93ff443…

MALICIOUS

PDF

123.3 KB Created: 2021-07-07 06:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7fd8c395fb1b5da1ae56cbef7dafb94e SHA-1: c1124fd2081118283b63c42a9ea3aa7bfaf35dc4 SHA-256: d98bd629b93ff443653f0fbf08cc358cc2f02cc865cb15690371f2356ce48e62
156 Risk Score

Malware Insights

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

This PDF file contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malware. The embedded URLs are designed to redirect users to potentially malicious content, exploiting the user's trust in the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://argentum.com/wp-content/plugins/super-forms/uploads/php/files/j5ua8laphtb7obppnojqk51sa5/wuxakerasebuz.pdf In PDF document text
    • http://stlnsk.ru/uploads/file/nusalumuxo.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/q2n9039453r65p1r7c0g9qmggg/lodininilapupajibeg.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/14263084826.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45c370b72f---55307292457.pdfIn PDF document text
    • https://area5srl.it/file/folotax.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/f2nlh8keiv4dgqp381a5gbpe0g/34619347350.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/fifija.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbbbd25820---21828931820.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/0sbjp1gu0smkue3aci45tc5tdp/vuvimaze.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/5fhqdqstml2b380hf446dubc05/96135852352.pdfIn PDF document text
    • http://theshippyfamily.com/clients/57051/File/lukevesa.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cb5e7b4ce---85225185411.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/perudafat.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6331b97be94e0aef3e494d8ae8bd45a1/11738994213.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160d6bb8d1e9c8---fazefudekulonutevomus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=tang+soo+do+forms+in+orderPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15449 17512 bytes
SHA-256: 5c185ad958c09c651b070bac4382654f79881e9148ce513edf2cd027d50a438b
font_01_sfnt_off00018201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18201 10516 bytes
SHA-256: a3e18d9675ae92159682277c07d15b49350f6d0bd41156982637fb98ad2c7419
font_02_sfnt_off000199b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199B6 16236 bytes
SHA-256: de86d23d9afa1d9ab344c6627519bbdbff393af144949a00bf9e6896f7c60d91
font_03_sfnt_off0001c818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1