Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ae3fd5d1caedfe…

MALICIOUS

PDF

74.2 KB Created: 2021-09-04 22:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2e03d2a49f0c27a2052f3fafcde1f593 SHA-1: 92464c987f2c50505913a719c49b0a15a8a42e6c SHA-256: a0ae3fd5d1caedfe789bde2d85e874567fb0960a8f1c8eb55e3f9c5c22396e05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. It contains numerous URLs pointing to potentially compromised websites or link farms, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to host or redirect to malicious content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=a+practicum+for+healthcare+technology+management+pdf PDF link annotation
    • https://menu2uplus.com/images/file/73301073574.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/99860799845.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/35962568371.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/75302038923.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/55088333462.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/36178698127.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16084bb943ef17---67734473187.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/54071507897.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rs0ai1jb8k3d28eobhd0u6q3f6/51607517826.pdfIn PDF document text
    • https://windsbs.biz/files/file/zuloponexum.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/54727363094.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/5119462b9bc6eac7240d020e534e774e/vavekoj.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/jiguwasiruzufako.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/48075595530.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/89o5a1o3isdfkjdj7tqodsa11h/xewajogesef.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cebec859a---jofixub.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa8ae6c213---93248657485.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/tasomiwijulepiz.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/t9k900i2qdlv029aceqst33bg3/71920888346.pdfIn PDF document text
    • http://raczcsalad.hu/files/94548596694.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081032edd486---kudixovipebixamu.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/vefovugorulobibarawakur.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/gejokejikeveviverejilafa.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/sarobujemaxalusinawu.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_off0000bf85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF85 16112 bytes
SHA-256: e2c7cd7add2b570a815127e31ce7b4f1287d122cef1a853f47b2aec356a6245d
font_01_sfnt_off0000e8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EF 11096 bytes
SHA-256: 895bfd8d225edf5aa6af693f9a3fa1af03763cbdf0971bad51e9037c54c5b58d
font_02_sfnt_off00010276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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