Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7de6c2fbda56857…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 00:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6fd8ae83ab662c56f664bd87e150a9e9 SHA-1: f2229b37993c44d0e41c6329243201f176ef77a8 SHA-256: b7de6c2fbda568576bb7260aece90c22d42d0081ba9d0f6fb7c68569392b3d84
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the ML detection strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3edd6c566---losulaneka.pdf In PDF document text
    • http://www.look4job.gr/images/_user_na/file/bovubiwurefi.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/85353907148.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131308b3c47d---39177244093.pdfIn PDF document text
    • http://agama-rc.com/upload/files/9561578933.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/3198996500.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/46115004843.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/69105851292.pdfIn PDF document text
    • http://sapthagireesyathra.com/userfiles/file/16623631398.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/mexigiruw.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/93092696644.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/84572890004.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16137642b3b322---27981144310.pdfIn PDF document text
    • http://videocycling.info/files/file/vevevusigexozo.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/96042415957.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/wamosubelawik.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/9326124579.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/kudimuvo.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/segid.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/riwibobogakomuguzinekik.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/pibokadagivirutaloni.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/09qj7u49v19k5kgcaiu0ur4ra7/giretegad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+find+wifi+password+in+android+mobilePDF 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_off0000db4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4E 10876 bytes
SHA-256: 70504a5e8ede5fcfb61b0838010ea1d2808f021097c8b37a00674a81d48daf32
font_01_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C43 18372 bytes
SHA-256: 038b2f43624877f90c968903d6cef78ad1620e3fb976b79ee59204e85e4f43be

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