Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6593d72fe644ecb…

MALICIOUS

PDF

84.1 KB Created: 2021-07-01 21:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ff081bd8ed08d62fafec7e135c6781b2 SHA-1: 8edab01f9810549df7340bbde4de744db60d8d5b SHA-256: d6593d72fe644ecb8d0ca30db67f65bdcfff69589059b9b953b218a140665610
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the ClamAV detection as Pdf.Phishing.Trojan indicate a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the link farm and the ML classifier's output strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=convert+pst+files+to+pdf+free+online PDF link annotation
    • http://bscsaoner.in/ckfinder/userfiles/files/fezavokipexugope.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/eb60co8stod1kldcdpuojvv3sd/7450971584.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609c05a16ac4d---23843475459.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/77956185996.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/wapuruwivesuzeso.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160767e1222b35---25396921711.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/f7f947e78c26652f1d1c8967f58429a2/3963196180.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/fenerinewokiderek.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/85506934943.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kf1hn4g9c54dmbhaie4d0c8ja4/25865820701.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/05f9422610ea53c443ffcb8e700d6a8b/90777491879.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/7bc2b385c01c89837cf925e30482a0ab/kedomowomutafukuvegav.pdfIn PDF document text
    • https://solo-enoant.com/content/files/files/kusekedogoluredobotenowip.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/sofuv.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/96880807665.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/54048688794.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160810a5c08995---75864863535.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ace0eac38df---19699595168.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/43271525916.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/51937613123.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/terikuworuzesov.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/jofawupiraw.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/uhr1atab9ggltdr6ggo105ojod/77986688936.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/261509920.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/8a42d11983acb606db79312d3e5013f8/70386747371.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_off0000e693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE693 10424 bytes
SHA-256: 36dfc3cd094be264a077a493f780b439194c42c37e4bbac1a8fc090ea7f02ee9
font_01_sfnt_off0000fe55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE55 17032 bytes
SHA-256: e09ad86556aff34089ea7d9df8b76ae6bf8d4e2ae671699a2a7122f0a29f74ab
font_02_sfnt_off00012afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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