Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3ff06f6aff2e48…

MALICIOUS

PDF

74.5 KB Created: 2021-09-20 09:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3327a1af64d5ee3d598235d3f386508d SHA-1: d769881459588157d1ef0edce15753210c4b4c40 SHA-256: aa3ff06f6aff2e4893363664d842717d13f30f60f01b524e4975b7008def430e
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown URLs strongly suggest a malicious intent to redirect users. The ML classifier and ClamAV detection further corroborate the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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 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://leinerpakgelatine.com/survey/userfiles/files/tejafelutijalela.pdf In PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/rafivifuguvufemojinagirij.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/26424066691.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/murobeposixudekar.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/91874364365.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/dikalijekamiw.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/bobakokisubuligewel.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161451d7388120---ximavutajoras.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/warolokevifesumukofuxexiw.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210917080050.pdfIn PDF document text
    • https://ghnservizi.com/file/39023197519.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/tolarimosozag.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/levejoxovuparizuw.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/lutigeruxisajarukofun.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/zitevaxu.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/wajavowewabu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139346e26fc3---sitomulujizarogezobadinit.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/36980011530.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/dasajoruzibo.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/85897057543.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/93899103700.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109141437302219.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614305730e08e---pafunorurirukakoj.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/dexafewobekutokuraxun.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210910174940.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/91873237687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=uncharted+mobile+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_off0000c0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E1 10852 bytes
SHA-256: e2c8da7af94bda4f28994c66ebe41c6c549849d0d97fd7708db9c9eb6b553195
font_01_sfnt_off0000d976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 16884 bytes
SHA-256: a6942f22f1ecf2da8b42a0f6c75366315ccd51393a84ef373bd7d903f58c4bb6

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