Malicious PDF — malware analysis report

Static analysis result for SHA-256 29f29f41759b66f7…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 23:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4193542248d0406a307ce062964bca0c SHA-1: 55a1a296b3ad148188e08acd1bf728e16f0aa597 SHA-256: 29f29f41759b66f71bd03680c4de072e053109d34bfc02045d9e04b4026bbb62
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, many pointing to disposable hosting or using UTM parameters for tracking, strongly suggests an attempt to distribute phishing content or 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://hurghadalife.net/userfiles/files/75684773734.pdf In PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/f9aa65d1e338a7ff2795eb18d2bffeaf/nujak.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16149ce9f45987---11095255748.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145ced514c1a---64203862408.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/mogusogumobarubiwe.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/30648118960.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150ce51d6d74---55826382474.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/pujilebi.pdfIn PDF document text
    • https://grouptm2.com/contents/files/23453778955.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/49736942607.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/74069494823.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/40252615485.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/1eba8469e39a9cb2a79acacc5355b06e/nifezesedufikakalexusadi.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/10877956536.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/xejewegutoxedaxifotipik.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/tanijedowuxewiri.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/ed7ed0d57bcc59f4f55704e42f4415d3/kipuf.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/zewaluwaxigusumosuvi.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/vaxewafovasutuvoxewapoma.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/62912575151.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/15674116751.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/sixuvosinamupiroj.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/9641012654.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=speedhack+android+no+rootPDF 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_off0000b0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90D 17404 bytes
SHA-256: 60f7665eabf34cadf1dc85f618054ba2056cab5df875c36c54ecd8aae08f199a
font_02_sfnt_off0000f5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 10564 bytes
SHA-256: e50ac157819787c39cf23b38e86647898b1bb40523ba9d93f7863c48916ee35b