Malicious PDF — malware analysis report

Static analysis result for SHA-256 10407f20e843ce85…

MALICIOUS

PDF

87.8 KB Created: 2021-06-29 16:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c64b7c153591e91cce770df53764c688 SHA-1: f009cac4f681cb5171fce64f79068b936b6ba484 SHA-256: 10407f20e843ce857fa94e0e58edba6e8dd303e491f752b0ffa4beb969aeae7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves directing users to potentially harmful external sites through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://accessiblevehicleservices.com/userfiles/file/sosobamafipesotibun.pdf In PDF document text
    • http://acecaalcoy.com/userfiles/file/luxobonavu.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/roxod.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/novutexupezorex.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/nafixapadebarumisonexufo.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/femiguxubud.pdfIn PDF document text
    • https://avenue102.com/uploads/file/taxoxofabikaxos.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7c3e0a9ec078b2b9d93057fb1585c174/82202968396.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/nhmo14kds2sn9v1aekntq77umj/guvinenokarofubepuv.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d72d3616b0d---nodeposapomi.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/tikixegemozikuvoma.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/75513214163.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/9ec0fb2f9407b8a4ad17074a585b5513/81977460593.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4f9f590a6---silerogifegejanati.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/9cab23262476670b9ce17506fa8e9cc5/30916227346.pdfIn PDF document text
    • https://ebooksweb.net/files/file/60064895362.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e839dd8cb9---gebulituburagemum.pdfIn PDF document text
    • http://apsons.eu/files/file/74691686986.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/43f61daac4bd2e1466e56aeeb6c78719/jusavireduvuzujiwege.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57fc065a95---11849709461.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/lufolovatexasabujosebude.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d605e65f4---jigojumemivijanejesizorad.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb49fbd816---67439082454.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609744dd3316c---13240114330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=overwatch+year+of+the+pigPDF 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_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 10732 bytes
SHA-256: 4f3a252dfb8526393bd961e545216a4f80994ad617329f3f0bc1de04d522e769
font_01_sfnt_off00010a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A61 17636 bytes
SHA-256: 7e403e5167dd6f829527a0fd566975948ef8b743e547aea0ffb9221604efe412
font_02_sfnt_off00013861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1