Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68f9937dfc0a3b0…

MALICIOUS

PDF

74.2 KB Created: 2021-09-05 01:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71ed6c95f0635d5727e02f5bbeca8e63 SHA-1: ef9cbf20ad9072675b5475a8e7256d607d833944 SHA-256: b68f9937dfc0a3b0a51e1af8d80b1223ecfe4ef21598dabd47cf3582d1db4e79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malware distribution or phishing campaigns.

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 http://chocoenglish.com/_UploadFile/Images/file/jupitedujumogovex.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610d898f5109d---gajunajusonekaror.pdf
    • https://systematix.pl/userfiles/file/xulotupumapuxoranej.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/a2bbb384cc9a3909fe319e5d25045722/95171961226.pdf
    • https://sklep-pinokio.pl/web/uploads/files/68513833915.pdf
    • http://tbm-mova.by/images_from_html_editor/file/kewadokadokofopuparawuj.pdf
    • https://cvsc.co/userfiles/file/vutuwebiwi.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/9f7b925ca0cedbfea24672cd8ef7e910/52168893326.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/mu26gqapcc0hjsg9d9nidmg0n4/roborulaxamodapu.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119d50fbf16a---74134145685.pdf
    • https://amitadevnani.com/userfiles/file/xotirarebamivuter.pdf
    • https://nenanhduong.vn/Upload/files/54925467552.pdf
    • https://concertwristband.com/resimler/files/46040550326.pdf
    • http://jinistudy.com/_UploadFile/Images/file/68944897390.pdf
    • http://elitvorota.ru/f/file/2847452594.pdf
    • http://jtour.vn/userfiles/file/45624970364.pdf
    • http://simonide.org/userfiles/file/82538201464.pdf
    • http://trhs64.com/clients/c/cf/cfad56e582d93fa9eda51f2516e23bdb/File/22504623142.pdf
    • https://najarshi.com/basefile/najarshicom/files/difagudud.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/5f5a051323915d8120a474d27c07ab1e/49695605739.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/35567668388.pdf
    • http://gshosnab.ru/userfiles/file/26602859054.pdf
    • https://mobiligennari.com/userfiles/file/38927741067.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=united+technologies+annual+report+2017+pdf
    • https://lapdonline.org/file/xikojorupeseletosabun.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_off0000bf8e.bin
2593525ebdd1dcb31d51588f8b9b6c7af91e9e3b65fdbbe748f8aab2598614f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8E 15892 bytes
font_01_sfnt_off0000e817.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE817 16792 bytes
font_02_sfnt_off0001002e.bin
7de52a88cba50391db6897cf3a79930fe104ebd1ebe684c4eb4d9b1c6f3a9bf2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1002E 11348 bytes