Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e38911f1d199c57…

MALICIOUS

PDF

72.7 KB Created: 2021-09-25 11:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 37e7138f2ac98113deb14ea013514b56 SHA-1: d4220259ddf3c67e93a3174163616fda4a637b21 SHA-256: 3e38911f1d199c576dfb58001d0cbe25b741efc1514749b1bd4743f04ddd0eb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS uploads. The presence of external URI heuristics and the nature of the links suggest an attempt to lure users to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://vibingvibes.com/userfiles/files/xifipadarebumip.pdf In PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/21735184439.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/deburuwirugofifenol.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109050242137258.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/21815006403.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d2460cc8a---lisijobulojuxukisiwem.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/5af905982c27724e3614399ab5a99c32/96043887763.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/jogosapof.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/20747853938.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/11746261538.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/65288524480.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/xevup.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/4453218198.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/lelomojowubanotoxovakexo.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614beab97744c---mizolaxizujiwopozodonotaj.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1614666c137931---gogojewipe.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/1149268336134e29c90fde.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/lituzulirutotetulisaw.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/38777984084.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/32977769934.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/11926313248.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/16333962051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=watch+new+bollywood+movies+hd+printPDF link annotation
    • 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_off0000b60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60E 17436 bytes
SHA-256: f2e52f8fdc4d851aac7e7c48d3766e45e8743b5e056ec6abc26bb69a25f81f81
font_01_sfnt_off0000e2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB12 11176 bytes
SHA-256: 40b89d9a8600bf3ed1b7afbaa3b8b5b8af5491483a86126b3b18cd0781e8f6ef