Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6bf09ad40fcdd4…

MALICIOUS

PDF

76.9 KB Created: 2021-09-18 22:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 550c214c1c4ed04f761297d1ed4449fd SHA-1: f970ffe36343001567c87c757ee2a5b7727a425f SHA-256: 2c6bf09ad40fcdd4e3d153eac023aa9c8bb2ddef9f597c85bc9244fec9097cfe
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS uploads or disposable hosting, indicating an attempt to distribute malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://oniceh.ru/uplcv?utm_term=view+cookies+on+android+chrome
    • https://hotelgaric.com/upload/datoteke/64774399180.pdf
    • http://misterholidaysanprisco.it/userfiles/files/16016740710.pdf
    • http://abcbyspu.com/ckfinder/images_store/files/fowatizadizedefoxivuwo.pdf
    • http://cu-mbc.com/ckfinder/userfiles/files/75987686807.pdf
    • https://ozsersogutma.com/upload/files/bewagegeti.pdf
    • https://rmp-familienanzeigen.de/cms/files/dawakadevodenepo.pdf
    • http://miryangpension.com/FileData/ckfinder/files/20210905_C03C5B85648949D1.pdf
    • https://auto826.vnpec.xyz/uploads/files/buduvetajarulovuruboga.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f085bb69d0---39128959586.pdf
    • http://di-tech.kr/fckeditor/userfiles/file/84541137811.pdf
    • http://evola.it/userfiles/files/99524366792.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/644448db86e09ce7845759959f7322fc/kenulapefu.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137396ac2484---95700654452.pdf
    • https://vmwarts.com/ecovic/file/38157823008.pdf
    • https://ddc-touggourt.dz/ar/files/55789696844.pdf
    • http://avandcie-energy.com/ckfinder/userfiles/files/bulezomuraxaxubademan.pdf
    • https://webrobogo.hu/kepek/lefelaputetazip.pdf
    • http://esistore.com/userfiles/file/mitolugarekutevezawaziwi.pdf
    • http://bright-inter.com/file_media/file_image/file/dufidi.pdf
    • https://nucamsa.es/userfiles/files/14520011154.pdf
    • http://volareinmongolfiera.it/userfiles/files/39797456186.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3d8ed87fb---gowitujizeme.pdf
    • http://labsshop.com/d/files/5072640289.pdf
    • http://popeyebio.com/upload/files/96173184017.pdf
    • https://confetti-seasons.ru/upload/files/11245040217.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A5 16792 bytes
font_01_sfnt_off0000e0b7.bin
ea797ea063dd3ad69e85e14b7c557e541a16bf039caee1faa82be1c640a602d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B7 17224 bytes
font_02_sfnt_off00010d7a.bin
bd2e82d61d2d7b56754d677052a261f2c8367a47022fa6bdda858320b3696943
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7A 10640 bytes