Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8227c318b3c62ae…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 03:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 894d639656fe8722a0c9e28787f1d4e9 SHA-1: 488bf08e7494f809ae4f10338a7283d6cee5ef1c SHA-256: c8227c318b3c62ae8da7db0d668bc31ed68932a5056a8e2b9d65f6b167f11665
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It functions as a link farm, containing numerous embedded URLs that point to various websites. Several of these URLs are hosted on compromised WordPress sites, suggesting an attempt to leverage these platforms for distributing malicious content or conducting phishing attacks. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.mezmat.ru/ckfinder/userfiles/files/83147390986.pdf In PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a380153a375---95056601505.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/c13f5ccde841467a13d4fbc7f7e064c0/76150628870.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/paxawopumazaditilujedew.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/gigebovopegifozo.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210819_C46E04511FCE3807.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/sipomomamidetotekijute.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/8749679.pdfIn PDF document text
    • http://www.ximangsongthao.com/app/webroot/uploads/files/kipilanojutadaledudujigu.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/71356852962.pdfIn PDF document text
    • http://holyfamilycyo.org/clients/37654/File/49371637220.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34302cfc6e---23080505854.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d062c7937e---vavudi.pdfIn PDF document text
    • https://kajariaadsevents.com/admin/uploads/file/tobetezawodalugaxelis.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609c11f904489---muzuris.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aac10cc8a47---39383085313.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/lisux.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/86145376724.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877d02d389a---45825130129.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/93694359936.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b6da0ad49---27002489675.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/koduxoxetod.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607898d36ed0a---19306249320.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/2285732636.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/jo808u6h8c8o5in3rag3hr3cc8/27960728547.pdfIn PDF document text
    • https://stopserv.ru/files/file/tuweriduwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=icao+annex+12+search+and+rescue+pdfPDF 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_off0000d9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AE 10808 bytes
SHA-256: 339a1d0deedbb019764f80bfde275ad74e0af8cc4d0791ae1caafaa94431ac8a
font_01_sfnt_off0000f2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 18144 bytes
SHA-256: 860485bb423e7d2ff440791bb43aaf9af97480a26ccd5224b79c7cf661d806cb
font_02_sfnt_off00012106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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