Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac02358c789f8e3e…

MALICIOUS

PDF

92.5 KB Created: 2021-06-29 08:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 856a57454d1081e3a3cef06c160c0866 SHA-1: 57312dc64c07dc25643eebc7a89016647c5225de SHA-256: ac02358c789f8e3ebd8de9e59cb580c952731c52b6c436258b9245499a25bf2d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/cka4408mguc32pi42skdirqlh1/sitidoputigarijamawisu.pdf In PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/1e2624d85f728f7c9143643c04c765d0/10856089146.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/75127116307.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a735d211455---92593785120.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608662053bf3b---33452061533.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/tuvazibotesipar.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/tugetiwasutadarevik.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/128f3e0582ad2d3be595329703b07999/kawolekovujap.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/5a24a4754b936fd8439d5b8709de35ce/kidox.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/58e62275b9d63c52cf74960dd3e80b4d/34244892976.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74512b0306---75957443711.pdfIn PDF document text
    • http://bjallstar.com/upload/file/luzunokedenonelun.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/861c42e4d405578cd65f229b3d3147d0/torulilutusesasugopiduzop.pdfIn PDF document text
    • https://webmenuplus.com/images/file/92721904095.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/xupokidonezoval.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/0fc7050fb3ca7125b698362a6632f147/fejume.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd5e19b7aa---22321373230.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160788b1befa24---54622450900.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac34de51c4e---45848738846.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c863c7e6230---42511126774.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/95622690520.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/128afea4e03426be4f071976acfb36b8/39870361476.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/48376051060.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b3edda17682---83367076048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+merriam+webster+dictionary+of+synonyms+and+antonyms+pdfPDF 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_off0000f87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87E 19100 bytes
SHA-256: 93d6b2499d99554b6736a7cf42ec4f0739ddb51910b13d4c1fcc221554dff785
font_01_sfnt_off000128b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B7 11144 bytes
SHA-256: d4a531ebefce8a59ebe16518ccd91134d91f0d8ab6199023d5b927d00fe72b2d
font_02_sfnt_off00014265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14265 1996 bytes
SHA-256: 0f857459d3f09244b4d034349dd73b03fb52d61d8ed81d956356b3e388cef6f2
font_03_sfnt_off00014b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1