Malicious PDF — malware analysis report

Static analysis result for SHA-256 37148bf07f3a30a1…

MALICIOUS

PDF

86.1 KB Created: 2021-09-02 15:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: badd161783e52e7ba84c32f5cc5f0613 SHA-1: 58ea6ee3c9a65e165fe9e81475661ba22db6ede5 SHA-256: 37148bf07f3a30a1162dede14a4de4a36ba3e88f69251e976882da7d633965fe
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting, suggesting it's used to redirect users to malicious sites. The primary attack pattern involves luring users through a malicious attachment to a site that then redirects them further, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://synerhu.ru/uplcv?utm_term=nlp+techniques+list+pdf PDF link annotation
    • http://www.aluvascientific.com/UserFiles/file/vupajatopebalefanipazeluk.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/ralutovifopawimep.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/1cc9da4cf6b83736d6f8f086b41b0739/59023825198.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/3724288225.pdfIn PDF document text
    • http://sammyurias.com/userfiles/files/38363150866.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/9148907426.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faf93d4bc45---mavuwogikiratunulexe.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b186b250db2---kerolidod.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2c8e13b2df9de79239d4f333af7dad63/vutiwufikijajuxizuzubofow.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc09e0b3e3---41382252052.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c6a3b2a206ae8268f01e06968af5bdd9/76049361641.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/gedufit.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/bonibuwibenixorojipib.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/881d187f0b22468d4062b779dbb5747b/jaluzagutoson.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16123e94126b32---81864763780.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/bakuxilijuk.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/99640441384.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/0u9j02fptpqlohc03svd04g4bh/81311102658.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/28833773324.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/54519927386.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/c068885faa10f2da4b6566b98a190a2e/levit.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10419 18316 bytes
SHA-256: 34036cd8a676375afcd11ae9b0e9a4bfedb97abe10f356cdf31e5608709d9765
font_02_sfnt_off000133d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D6 10560 bytes
SHA-256: a93bf5fd4aaab2c5ac14cfcd6d82f9d9846b81cef85d0f14e0b8809bf9b70155

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