Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f857b7101595838…

MALICIOUS

PDF

77.9 KB Created: 2021-09-09 02:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 894cce3bf51e98eaeca950ba76c43868 SHA-1: 02cc4bd0821d62f745e2ac30c03e380caf548e38 SHA-256: 4f857b7101595838e34844456dacfd183d3c945f262cc9e10fabdda581ac1f8e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://bhartiyambeohari.in/userfiles/file/mawopedunixonarex.pdf In PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/fotomozafikuzanumutasabi.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/mubuzuxidetutixipun.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/vedawitamirux.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161307e0933af6---86190867988.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161315da2c5cdf---79806912642.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/bigidexisedolirivuvu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135a43c20aca---6611083915.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/gojufezip.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/15312336300.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/pifezenurisizavip.pdfIn PDF document text
    • http://hmed.vn/upload/files/77527177787.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/depegilokojurido.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/watotigik.pdfIn PDF document text
    • http://kaies.cn/upfiles/2109080428293776980m7rc5.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/38642673490.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613935960723d---16352747863.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/wekulikajisif.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/vamukenuvilis.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/60420647208.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/zapazanodugutotinafokuxuz.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/fujowokadinizadejuli.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/wotijorixamufinixupe.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/ribekakela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=bad+genius+movie+download+in+englishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00010d54.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10D54 18276 bytes
SHA-256: 40872f83ab8a739e4c5171795ea599eeae5774589e38809a0534906ee64e50eb
font_00_sfnt_off0000b369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB369 10800 bytes
SHA-256: 82d569300e4c2abb1c8e22d2ad29689f6b669547e054967bd19a9fd1515e1f72
font_01_sfnt_off0000cbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE8 16220 bytes
SHA-256: 47e416cdcca9a9dd78431377a90e12e209ecb1df0bc815a515ae8bfa02df86bf
font_02_sfnt_off0000f543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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