Malicious PDF — malware analysis report

Static analysis result for SHA-256 26fcb15053aed86e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-19 20:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c22d5426053833f0f8b7a18f66351ab0 SHA-1: b5f454741c1326609c760001db78c8b25eac9f45 SHA-256: 26fcb15053aed86e051d1cfe4f9dabb5ea674daaf1e2b9bc4751cca16e41878c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple compromised CMS upload links and a link farm on disposable hosting points to a deliberate effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=cops+and+robbers+download
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/16062565585.pdf
    • https://hatinhjobs.com/upload/files/20264975518.pdf
    • http://urparitet.ru/admin/ckfinder/userfiles/files/xibodan.pdf
    • http://tuanlongland.com/upload/files/8339328124.pdf
    • https://spvi.cn/filespath/files/20210908202958.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/995d3efed4aacf88467f1ab04ffdb13c/volatiluvofeluwepoz.pdf
    • https://littleitalypizzany.com/nbloom/fckuploads/file/tebunok.pdf
    • https://purevdavaa.mn/uploads/ckfinder/files/dededofufoxuronodumozuwiw.pdf
    • http://phayaotechno.com/UserFiles/File/jumimil.pdf
    • https://dukupahit.com/contents/files/63237117083.pdf
    • http://fabrikando.com/cmsimple/images/file/74724974998.pdf
    • http://ff-engineering.com/userfiles/files/34647073557.pdf
    • http://ajk-opakowania.eu/upload/fck/file/92620067499.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/32b82f45344c9b54c43f5c0752381015/67437130813.pdf
    • http://ghettaetamionarchitetti.it/userfiles/files/baliraluboxeganuvasetave.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ac6241f42553f4b077c55d012d10167f/jijekijesulogamutanego.pdf
    • http://expertsystemgroup.com/file_media/file_image/file/42783764299.pdf
    • https://sunarchegypt.com/userfiles/file/megutarodelufufusaz.pdf
    • http://apartmany.cucoriedka.sk/data/files/puzarajukuj.pdf
    • http://instit.ac/ckfinder/userfiles/files/miwenon.pdf
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/93082582792.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/b799b5a3e3bcd886538dd9f2553a959f/kelodupiluxizilifezimapu.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb200c4801---wositidebifunikapunaziniv.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_off0000b6c8.bin
9c7478de6fc74ac90b7126706c7569f860d9687e76f4ee7d195c1cb6dbf24afb
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C8 15884 bytes
font_01_sfnt_off0000df44.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF44 16792 bytes
font_02_sfnt_off0000f75b.bin
92c196cd13805eefc4cdd7ad766e7eb7b2eb0565765e5dc5ef696333218ed10b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 10452 bytes