Malicious PDF — malware analysis report

Static analysis result for SHA-256 d322f467dcecfb30…

MALICIOUS

PDF

85.3 KB Created: 2021-06-26 00:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99824387198e8e553fd9c728e08d5a55 SHA-1: 4700b4a9dd29206eabd8ebe3d316353238bbcbfa SHA-256: d322f467dcecfb30b34327bd48c058427cf301eb2ba97499f485aacffca06c3d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a large number of external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or to download further malware.

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://nomylo.ru/uplcv?utm_term=body+tremors+during+sleep
    • http://mosjob.ru/images/file/84621232380.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72a01e2bb2---fokav.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/ijs0q511clare4uq7obc2b8984/kutixakikezuwalez.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/dc288ade3e676b1f581f5a14cb4c6f40/9847356601.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9bf4bffb4---tejorogajesawulur.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6ac41e6bd2aeeb34b91e1ad84eaf3ad2/ninuzidowizojufedowiko.pdf
    • http://kengosushionlineorder.com/uploads/files/41010463461.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/3fee79a92a1c1fb5856c023571bd09e7/17476636869.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e6ea900fc---xivunobetufufogeme.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160acffff823d2---bufufomiroviji.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/7218c0289d370ea221692c64cf9f47ff/61168574430.pdf
    • https://viboot.com/ckfinder/userfiles/files/jusitabujazi.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d251ce4979e---37653866703.pdf
    • http://alpinedelhi.com/userfiles/files/dukowejijibiroxok.pdf
    • http://shipagents.nl/uploadfiles/file/rapubosigu.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfce993f71d---jodabedejisiwo.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafdb1894ae---75038669140.pdf
    • http://broadgatecapital.com/userfiles/file/bumunoda.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/41362acfe10acff9ceac19c9b93ef3c1/63736062070.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/b0v941t993maeu0k6jg8ru5pc7/wewodufo.pdf
    • http://ip-golubev.ru/ckfinder/userfiles/files/90977025406.pdf
    • http://tamlaproject.com/userData/board/file/jabefumafobinaf.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087652d9e734---6729883303.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_off0000e9d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D6 16792 bytes
font_01_sfnt_off000101ed.bin
8c1fd1111da6b7517a74fdea92c7b228095761c042929fb866923b9f13b96320
pdf-font-stream PDF embedded font (sfnt) at offset 0x101ED 10840 bytes
font_02_sfnt_off00011ac3.bin
c58b24a5379ffea2695f2e47b896d26e27732e17d0aacd9bafb200f153caaa37
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC3 17316 bytes