Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98627090bad42dc…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 13:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4491ba6ffe8f8ecfcd4291fcbeefb5ef SHA-1: 2ca3d680383fe3e9e8f1c2eaeb7702478e71b5ad SHA-256: a98627090bad42dcf0f08582236d22aba4fb0315edf2b01bd03719e91b867968
156 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 a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/7jr2del3gh7qpid8npbs4dgk6u/88961526373.pdf In PDF document text
    • http://boek.se/bilder_umeny/File/topumerepakasidosej.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c1503b4fb---bajurobag.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/49106929617.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/oar4p1ceu3lq6rsi68k6n32k45/kumewur.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/3e16f9c04451e35948011712c3201624/dakufajijuvonuvovalajag.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d6495c59f---92531728835.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/43059705636.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/55054080390.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210821083051.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f1bfb4c2346e941a4826546214bd66d4/70018613797.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/jomefun.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79a39c9029---kumesuvuwominegekogomi.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210831063113.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/89819612630.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c188e56b1c4---dapuwiped.pdfIn PDF document text
    • http://roocenter.ru/upload/file/70776932141.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/wokiporobenu.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/fogurujelikiwexe.pdfIn PDF document text
    • http://nessium.net/userfiles/file/80698866937.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/zezopemewiradenimun.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16126cca21c811---filunigusumedogubupoteb.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/tebakujudegag.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/10791439827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=instrumentation+technician+training+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC3 11072 bytes
SHA-256: b5c6ac7319f258173d949ed47112b3dbd8ea441a99e4745818f6ed70902400ff
font_01_sfnt_off0000f631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF631 16612 bytes
SHA-256: 1cc130693b761caf10da2659e5403ae02e82fc67e5e01e5bc2962639d8ba4bf7
font_02_sfnt_off0001214c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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