Malicious PDF — malware analysis report

Static analysis result for SHA-256 8417b3dec2f4acc2…

MALICIOUS

PDF

82.2 KB Created: 2021-07-26 00:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d840b7da06c1bab782096e8589ecedc0 SHA-1: 5d16da34dbcfa77ed7d7a58b048ec4183304ab50 SHA-256: 8417b3dec2f4acc2794c6c4bef7c73df3d63cb4658f7fdcc8a044166807b2a4f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/29a02b31c4f2b74817ed723d8ab30d69/38706159991.pdf
    • https://trvstore.com/userfiles/file/pavum.pdf
    • http://autohondl.cz/userfiles/file/24611547140.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607854a5eea16---razanixekisetejexelaxaren.pdf
    • http://dailymaydemtien.com/userfiles/files/96110216957.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/68716732608.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/h3g12cmgcq6mf5fvnj5shmbsls/josiwalusudawewane.pdf
    • https://echipamente-scule.ro/userfiles/file/sorotanoradefovasigenariv.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/5ncfgi3uerqgikk7r872t0bctn/33429741152.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a67eedb45e---vugajamuziwiwemog.pdf
    • http://amadpich.com/userfiles/file/3476886965.pdf
    • http://cbgnfinance.com/userfiles/file/65813559011.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/a2483c00e971593b044ad088982ddeee/dukag.pdf
    • http://aggengr.com/uploads/CMS/file/71851402291.pdf
    • http://www.bash.cl/media/file/tuxivulaxamaru.pdf
    • http://tutek.eu/userfiles/file/vigujipuvorabezoj.pdf
    • http://yeosingol.com/FileData/ckfinder/files/20210723_4E017CE45153625A.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160e082723980c---memisuwaxurupifa.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160899a3cd1ac2---92851746140.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2013d6211---tefawosuwikuwovasuwo.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa6e8666c---88874437995.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070abb375845---82083838405.pdf
    • http://garderoba.sk/images/_file/36092495838.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=fur+elise+piano+music+sheet+pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a6d20cb108a272fb62795b5a5767d696/42272084469.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_off0000da8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 16792 bytes
font_01_sfnt_off0000f29f.bin
dee1c427301857dbdb81be0ac82ac6487dd83ab694050e66b42fc4a5f5075b0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 17936 bytes
font_02_sfnt_off00012198.bin
a310c884edbf84b39f8cb5dbb26d667a3ac11281cdc7aee4df22ae7d2f2f9979
pdf-font-stream PDF embedded font (sfnt) at offset 0x12198 10960 bytes