Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1c0a7b2b4d511f…

MALICIOUS

PDF

78.6 KB Created: 2021-07-22 23:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 66bf75689c47bd37ffb9187848b0d34d SHA-1: af78d2445c422f972f35c9ff9de4caf8849635fb SHA-256: 0f1c0a7b2b4d511f0d832b614ade40f6842e658e4df2f0487c38b3d38dbc46bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. This suggests a phishing or malware distribution scheme, where users are lured to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/34072599532.pdf In PDF document text
    • http://susasoft.com/upload/userfiles/files/28186085381.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3d54b1fc4---85975006071.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074680d0ce90---6013426762.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe3bec93a4---kesojeguxibagab.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/wagiwajogufodipalo.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/19744339456.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/1799903666.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210713_BF89A933C4383EDC.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/debazig.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/47884206599.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/4gjgla0qg8fq7b7gql94io1vra/59012912692.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/794e3344b53010b3a299d1107eb735eb/86483802116.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/wimaripuwaji.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/24817851186.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/52412481020.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/tuzatukalijoxopinepe.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/17269749527.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/770b6285eb2325656441e66e18fe1fb6/rivezip.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/047e8def9299ef059041bca289fd4845/40600750365.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/savabapedifabobepik.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ccu868hp3drv0cv1llp1rfc74o/52911360588.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6099f07fc---43355835276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=rock+bar+and+grillPDF 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_off0000cd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57C 17524 bytes
SHA-256: 9937af01ec7e80da2c910bdd8ef6ff84789cf9d83edd559e194052620103ac4f
font_02_sfnt_off00011362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11362 10424 bytes
SHA-256: a9c91ba679bc3d5181826907f251f0b80dda2ad789703c5d34ef2b9ad6a9284a

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