Malicious PDF — malware analysis report

Static analysis result for SHA-256 5574756bb8166c9f…

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 23:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 824cee9cceb2c9b095bc22c16fcbdf6d SHA-1: 8491572a827157bfdea31fd4d0a74c06bda4bcd3 SHA-256: 5574756bb8166c9f9bc937427369115b1bd94e0d832c5d538f8b9a78e4ae02c1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed for phishing or malware distribution. The 'SE_MFA_LURE' heuristic strongly suggests an attempt to harvest credentials or session tokens by impersonating an MFA or one-time code prompt. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://balbok.net/admin/ckfinder/userfiles/files/79029895753.pdf In PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/17956824475.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///24349990698.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/texuviranekavifupiba.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/de8dd2979fa795a75c194d2f5eb3759c/7963421074.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/82420149787.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/tigalafabobexuxo.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/favipaxebatukabevowo.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/dofagaritozi.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/43367144519.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137609d237ed---zizozisatodakokifopu.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/femaluvawivirosulem.pdfIn PDF document text
    • https://kerryparsonsfoundation.org/media/file/80411209152.pdfIn PDF document text
    • http://sun-tes.ru/files/file/nilakixogo.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090406455481.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/62746414880.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/27073296282.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161378fc5ad3ff---81703228457.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/89463097999.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/regadatekuluxokuwi.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/nedozu.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/17554314980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=download+gta+5+free+android+apkPDF 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_off0000d73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73C 10820 bytes
SHA-256: 60a0604d55b36e448270cd903dc396b683f9ab9eb51a4b5a3347df87d26de300
font_01_sfnt_off0000f030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10842 17632 bytes
SHA-256: 7a4cb0677ede44dfaceb0430f317492210c8751e3bd37760344c23ac81248c7e

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