Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7918f6f7531812f…

MALICIOUS

PDF

84.6 KB Created: 2021-06-19 07:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 74b6e1e7ca259aa012e3d108c9d81598 SHA-1: f7893ed8e9e04dfd6cbcb85dd951a4d545a7b6d8 SHA-256: d7918f6f7531812f84744cd64dc58dda59b2babd27bd9a74146d6b9657a1566c
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ML classifier strongly indicated maliciousness, and the structure aligns with a link farm used for phishing or malware distribution. No scripts were extracted, limiting the ability to determine specific payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b82c862f1a---fanowawusunerudelisirasug.pdf In PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076e43097dc3---72931903351.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d94009d700---27361181830.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/75786916877.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/irc81hm1dljv7hdg3i47pn9d4q/mazog.pdfIn PDF document text
    • http://446888.top/userfiles/file/36632801857.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075ca95debe4---94882063706.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/dae5cd7b0797c58676688e0a74b4948d/67591580684.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/20606aea7910e124c21f3f5c449c3dc6/pakupobizanapaxevu.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/83064829051.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/sajagokujusudul.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/wuxawujivulazogakitiwi.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609189e03ee62---vurawav.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/jujoko.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/jeruvaruletutew.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083cc792190c---30030667598.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16099b5ab7884e---61682026548.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=filma+24+hd+shqipPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3B 19564 bytes
SHA-256: 0e5edf197f949f4f26c3d5125759e728e01577fd3362b25b179bb2125f1d1a00
font_01_sfnt_off00010cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC7 5404 bytes
SHA-256: 4029f851dd689106b51f68dd5085b3b245d9efd46288d68afe7dfc4a68e0709a
font_02_sfnt_off00011f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0F 10776 bytes
SHA-256: 1218f581a4dc66011910222b0260db401d3f265e1fee0db5b157a5593ec24630