Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc27c66489f8fe5…

MALICIOUS

PDF

68.5 KB Created: 2021-09-29 08:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5e79c73acddfdc8f702c3439e56bb1f7 SHA-1: 82d1c32c0894b4db2a59484c9dea451395dc41d3 SHA-256: 7fc27c66489f8fe5bf264e447d0da506db4468d5e250ea45d5acfe9ceb454e6b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to external websites, many of which are hosting other PDF files. This behavior is indicative of a link farm designed to redirect users to potentially malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=jiosaavn+pro+subscription+free+apk PDF link annotation
    • http://phongthuyphatloc.com/luutru/files/66110926585.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/2001901355.pdfIn PDF document text
    • http://4226080.kad.tw/kads/ckfinder/userfiles/files/kaweridisem.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/41594967331.pdfIn PDF document text
    • https://blogsma.com/files/vumosejilodejafaxodad.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/wupejowexelafajofu.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/84637546631.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614121ed7ca9d---kijiralepuvipobaj.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/tuvamurudimebuvapefesux.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c029dac7c---lepekuxasugepalufelej.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210920052841_0xr5vj.pdfIn PDF document text
    • http://belovosushi.ru/files/94589310265.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/tinububamovevo.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/55696775938.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/41014927614.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/risun.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/28691337092.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/dce259b5795ca17f94820ab349cbb355/83979646764.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/vipeliseki.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcea1d92d7---78382178774.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/vikebapamunofusagano.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/fafagabagox.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161306cfbdb75e---peduvumow.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/69854066265.pdfIn PDF document text
    • 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_off0000af4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC764 10816 bytes
SHA-256: 6dfd5cc908bbb55d5f107df43fab5468b4b485f7e6f6e7411f40c445ec132a97
font_02_sfnt_off0000e059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE059 14500 bytes
SHA-256: 36eb24b7067870e83e454466607e86ea722467c68c4e63459f031d26de296822

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