Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2a3aeaf4687f85…

MALICIOUS

PDF

92.5 KB Created: 2021-07-28 03:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: d7aad97d4b696ddc15c10fe5d0cb99cf SHA-1: 5c8d47f2cbfc5476e5d13da30748f20730be9351 SHA-256: 6b2a3aeaf4687f85630d8dc91c8db0700c1c36841b6c8f097a1f4c72888fc4d3
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://servmed.net/userfiles/file/34385506816.pdf In PDF document text
    • http://yuha.be/_files/file/5077381485.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210722_FBB310AF476D7044.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16079d91622689---mesuregu.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/68839538002.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a93a249070d---jixiri.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/nepalodebavapazuzulabara.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/fakedevenumime.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/10526600182.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/6c7ec6cdff30a953c292266a1ed194be/95726025736.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/90729496218.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/29491982199.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/zopubav.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46936166d8---lewidusadiminunor.pdfIn PDF document text
    • http://france-ex.com/14402946895.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afdcad87bfe---43236291968.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/budewojepe.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7f86f15b4---mezajuzugozewuzubijorani.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607633ebb3486---burome.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c57ffde34438a11e9cdd562ddf4ad184/68636174562.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d916bb504d9---12989585923.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/sowulukepolanesomane.pdfIn PDF document text
    • http://flexa.cz/docs/file/gavedalu.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/81282201875.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/velorevuputagif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=dolby+atmos+windows+10+crack+2021PDF 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_off0001030d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030D 11124 bytes
SHA-256: 3e0211c537b249082f0b11d5e8f827585f4b9c34473e32f64c55e9af88bd7f7f
font_01_sfnt_off00011d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D26 16992 bytes
SHA-256: 90f42f38bbc2a6f8e79a92d0c587322755869bdf82cbc7992e3803e04caab73e
font_02_sfnt_off000149c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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