Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8e9802432ed5a4…

MALICIOUS

PDF

71.9 KB Created: 2021-09-10 14:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e616023a367a672029ff0527e34d3bc5 SHA-1: b480150468734bbc98099cd710b97dabe5b1b9a5 SHA-256: ec8e9802432ed5a49b36806eff5e5ee3afe5aa3f385bf5c942024e5e49a11a91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the nature of the file as a potential lure suggests T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://king-ber.com/UploadFiles/file/20210907150314251.pdf In PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/16902249241.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/83880577263.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210909_122458_9691.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/sobexawadek.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/zuxepomesid.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/87355577879.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/99832828018.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/71157086759.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-2/20210902021029399020.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/jifavisov.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/tetujafune.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/rosexuzik.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/62588049980.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-8/20210908015728940586.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/geno8qlb5hrlucbjvr81ttk6r2/fakosonidi.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/pemuliximimonalotu.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326205e872f---defotulenusuvizebaw.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/40128205325.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/lelalujobas.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109080613112498.pdfIn PDF document text
    • https://mimpidia.com/contents/files/vigaje.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/b71ada3da1603b31353c68326cb8f389/74816331474.pdfIn PDF document text
    • http://amdind.com/userfiles/file/94668740910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=micro+office+loginPDF 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_off0000b79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB79A 17136 bytes
SHA-256: a8b4690872b120c6f18a5a1ab82870e14089b7e6362301e2e29bf305beb806f3
font_01_sfnt_off0000e3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 10076 bytes
SHA-256: 52ad41c2555478629e51f0c071be9ccfa5b1ff42b7da8dfceee0e2cdf857cc26

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