Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea792cde6e5dd084…

MALICIOUS

PDF

78.9 KB Created: 2021-09-04 00:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3937c233f999ead479d5555d2fa88911 SHA-1: e3f0e16a63fa9823aeac950960a8775a9cdd0ec4 SHA-256: ea792cde6e5dd0847b784898553e7a741e87353b71eb7b42ce6c74dbd2cc35cc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous disposable domains and compromised WordPress upload storage, suggesting an attempt to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the structure aligns with SEO poisoning or link farm tactics to lure victims. No scripts were extracted, but the PDF's primary function appears to be directing users to potentially malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 5

  • 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://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/jisipifagasivubutifuwigu.pdf In PDF document text
    • http://czechnews.cz/userfiles/files/vezexin.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/kivuvudoxataxikirag.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/migasozovelaxopuvafe.pdfIn PDF document text
    • http://someteme.com/archivos/_20210721105921.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/80946594573.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/josina.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/22693122040.pdfIn PDF document text
    • http://jump360.co/upload/files/20210814171658.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/wegipededubodiweruwuzini.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609dca8d5f6a5---16533609437.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced46d7011---54823617821.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/6847789331.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/21e903d8adf6fba959c43ac71b27f4e1/8099528559.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/20989061981.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608de2886f5dd---84347247122.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/14378364644.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2e5cea93c---tatadaf.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/e61b2b9f774790a69cf8af674fa62e43/vexoroxamowuji.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/73936851444.pdfIn PDF document text
    • https://armenia4d.com/contents/files/36480494852.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210704_1D2121E5039880A6.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/botezaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=100+statistical+tests+pdf+free+downloadPDF 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_off0000ce00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE00 18156 bytes
SHA-256: a8da91b4c07011ba647c5d773e87a39caabaa753de92f49fd6f28300c4b4ac24
font_01_sfnt_off0000fce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE4 10776 bytes
SHA-256: 3317822d54bb8ee0e8c1d43ec528b76fa696846e6ec1dd5d05acbdcf2ca992c7
font_02_sfnt_off000115e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1