Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43b9c8b6ee175a7…

MALICIOUS

PDF

91.1 KB Created: 2021-09-20 06:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3bd5e6ed633ad166b6bfcc03038e4532 SHA-1: 537fcf6060d6b99039efad0b4c7a2287b0fcc858 SHA-256: c43b9c8b6ee175a7fa497ca99eda259b07427cdcfba5549f499e60ab840a91cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to trick users into downloading malware. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gesundheit-im-blog.de/userfiles/file/14097939015.pdf In PDF document text
    • http://cz-synergy.cz/data/file/5033017293.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16146050a1c3fe---97394632678.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/vilivelofupiz.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/74697839839.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/98318a5d56e1bc5a70fcdd48d0ac79d9/63363676776.pdfIn PDF document text
    • https://mikludava.lt/images/files/tojuz.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/fuvomeluxe.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/vibigefisaboxosaf.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/libexerokugozekizibex.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/rusikitajexegesi.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/88916683203.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/zuwadub.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/jijebini.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/13261251465.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/moril.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab4867397---38428616256.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/3176058587.pdfIn PDF document text
    • http://zeci.nl/im/image/80670954752.pdfIn PDF document text
    • http://risme.vn/files/79791241941.pdfIn PDF document text
    • http://zamgph.com/uploads/file/170759571805.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/3409420210.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/valijalamuso.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/tidukerugisufomoken.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16138122a6db09---nedazuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=now+tv+app+firestickPDF 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_off0000fbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 10544 bytes
SHA-256: d1809eaf99de593b299908ca9a2f5a001eb30ac6fb410a08ac57fc84e5493722
font_01_sfnt_off00011415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C27 19100 bytes
SHA-256: 44f31d62b13d7b529b79f99fbdab6efeb824422bcf2e4672448d4713d436e052

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