Malicious PDF — malware analysis report

Static analysis result for SHA-256 e238fce9039fd4b3…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 08:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 165ada718f5c72b6e6e9d1cab958714e SHA-1: 48477c93032d75e10ff30b748cc637bfd8e01b3c SHA-256: e238fce9039fd4b3cd3367afa65dbba2b7467ce3f1e774326e144e4f73e54013
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://www.htlexpress.com/ckfinder/userfiles/files/rivaxofav.pdf In PDF document text
    • http://serramentisiciliano.it/userfiles/files/pimuzulasazezo.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/xonawubezu.pdfIn PDF document text
    • https://breedlife.com/upload/files/79861600570.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/lisakon.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/20003333415.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/2glknb5lvlgp3utjcbuupp1esh/sirutaxax.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404e13d5639---31497004931.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/68041675071.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/sabilefogegala.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfb3204e16---jadeziloropona.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/2117505135.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/wiguwij.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/28536090671.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/bumepifokiko.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/42821201803.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/vogapalomimawazoge.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/tilivate.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5rtljnlbr6655lviakpk5pb763/kulojamepituka.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/53167297909.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/73908714084.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/gkav9oeevc1itu7n81vrk9lhrq/40482551809.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/waxixexuseperatazozoxo.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/wavogalakibiji.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/biwutibotobusunexajesa.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/fumuviso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=boruto+episode+198+englishPDF 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_off0000c929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC929 11088 bytes
SHA-256: 99e2c963fe63a921cc8a56e57188fa504c19a042739e37feeb46ff42ee201ed6
font_01_sfnt_off0000e2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 19680 bytes
SHA-256: 074dda7ad409b817f2caedffcc169bc51b0e255079ee7450d04910df2e96c940
font_02_sfnt_off00011709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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