Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35e873a89f93b1c…

MALICIOUS

PDF

83.9 KB Created: 2021-08-19 03:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 36b85bb5f4fb722ed58437449c34bb4f SHA-1: d01027349eb75818b0b21107d2d2148bf5e34910 SHA-256: a35e873a89f93b1cdf42d17cc53dca7a6d7d729ce9f88089ba40ef51265a6b06
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, such as the one found at http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a122b609696---61677004091.pdf. These links likely lead to phishing pages or further malware downloads, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f893daf3e---31275897159.pdf In PDF document text
    • http://acpiindia.com/userfiles/file/1527680368.pdfIn PDF document text
    • http://asustainable.com/global/file/26705784201.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/tifuxobibinaxonop.pdfIn PDF document text
    • http://gtshotel.it/images/file/jazikasezezixu.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/lizazaxoju.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/23795765365.pdfIn PDF document text
    • http://pjteam.hu/uploads/29534845558.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a122b609696---61677004091.pdfPDF link annotation
    • http://londonjip.com/userData/board/file/bozafufomibaruxejal.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827c9fed431---guzogaforamirirafeberav.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/6c7be5f2839be41607c8374d8b7c0684/43892153776.pdfIn PDF document text
    • http://chinazzjx.com/d/files/14747101106.pdfIn PDF document text
    • http://midel.me/userfiles/file/jexikajuwugudokina.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/sopojobirezeresokeguxu.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/wojoxopurepowo.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1f44509a6---gabavekubajegu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609c032b1e93a---sabaxiguxutifoz.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/0b03fbf12ac19c69be6a0b9cc6c60918/24926662453.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6dd11ef9b5d478e74a9d64bd2bae7a1b/xezagasesebafidebigawawej.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/65962740982.pdfIn PDF document text
    • https://webmenuplus.com/images/file/33176854174.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-8/20210708131430481231.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/55553340875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+get+apex+legends+coins+for+freePDF 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_off0000e8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BF 15500 bytes
SHA-256: 1a29c4a66cf3a83309d507432d3ef13a810bcb7fef7108f063d2486de97c1af6
font_01_sfnt_off00011080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11080 10972 bytes
SHA-256: 202ce5f603cde254d82157f4c49e24aae952d7de7bdb09d95f50949174a2420e
font_02_sfnt_off000129ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1