Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9165cc29e52511…

MALICIOUS

PDF

89.0 KB Created: 2021-09-01 07:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d3f327f07c337af5175e4496830e7967 SHA-1: 2e864f783c6c545aeaff736c973556776c1a80e9 SHA-256: 0f9165cc29e5251118fa60bfeac755bf92a414a6bfc5c52e67c0b81c1e25f3c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fa36e025c---64671551958.pdf In PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7656a6013---bujuf.pdfIn PDF document text
    • https://medtek.vn/storage/file/24633822226.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/robeb.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/57163676567.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/teniwunedu.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/96626396334.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/213295a3410e4b095a487fbbfecb4e97/23159619746.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105b080ebe27---gogibemewotoke.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/labovog.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/38592074725.pdfIn PDF document text
    • http://goneviaggi.com/themes/userfiles//files/16093062488.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8b2567efc---popojetafus.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/dizevanogobowefumaline.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6a636adf0---42053822902.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/3cf664ed433bb9f1d687cd799395ae8e/buvijoxuvilunam.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210703_5F3C26D107004EF6.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb2701ca4e---zugubozitetuf.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/5312038004.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/66249328334.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/185377261460d494b1b097a.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719b5e478e7---46667747369.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/lijosegolupu.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/87610032381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=10x12+drawing+room+interiorPDF 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_off0000f682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF682 18076 bytes
SHA-256: 950676a2d460dd9f0a03d49388f5fd1c2ec7edd592cd99deee78f6bf8550ea1d
font_01_sfnt_off0001255a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D71 10760 bytes
SHA-256: 86bed8f78750c2c77f937750dfc9b4cd4395d848a4be56a709fe4c86f5025198

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