Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab485dc6339d61e…

MALICIOUS

PDF

89.3 KB Created: 2021-07-24 07:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 978b673e9419bf2d7d5d7f2bef4ee1c9 SHA-1: cd28b17ff92928af5b36d52cbcd4a3a283854758 SHA-256: aab485dc6339d61ec4b3a2f99e41637369c7ed1ece9b9ad31dfe2b3235dd7583
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be non-readable content, likely a result of the PDF generation process rather than user-facing text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://rasciindia.com/firetech/ckupload/files/15162199115.pdf In PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe000ae304---sizujibevudagopux.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5c34f0c42---56529520572.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/67544988632.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/45611696853.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/58708956164.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210527063036.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/kotewavimerubonuniv.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/51656313196.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ra740f2bs1qbf22so5jsv51hf5/xibekonezexepew.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/91653013321.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/35604358254.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/16cb206f57bd00fd6a55d0ca588479d1/21171687809.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844b5cb797c---kotadudidunozaxasuzofik.pdfIn PDF document text
    • https://cargotavio.ru/files/file/tugiwi.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/tulod.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/47594644358.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/55152532358.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/b06161b704e89c9ece616b56c8099bad/nenodagojozobajux.pdfIn PDF document text
    • http://westmont1970.com/clients/1/1d/1d0046bffbd1a03ca32bb02538d2ceaa/File/vakizevukusajuwobatojij.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210713_B92EC9A8E7232065.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a91ee164322---29119120120.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/kolanupajob.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/3570911508.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb5223dff---18732225555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=violin+sight+reading+exercises+pdf+grade+8PDF 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_off0000eb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB96 17748 bytes
SHA-256: a4f766e16e385a676e34ab401f23e6c1df5f19f93924cbf3af300481f9cbf273
font_01_sfnt_off00011922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11922 2636 bytes
SHA-256: 94d715ecd811953b7e1c24952c681b401dcd3a660985c965bc9867414a809968
font_02_sfnt_off0001243c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C53 11180 bytes
SHA-256: c6eb36a92a92aad52c471277227219a678d127d650b8615bc29a91a4abbd0d83