Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c35c11982d1d549…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 08:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10b91977fc320ebdffea63367ce92d05 SHA-1: 6663d409105b4d9a339c04f31722504defea8bec SHA-256: 9c35c11982d1d549fe358e02236a8e1ebb12c37f54f13a2e2c0f4731d81cf8c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure, often initiated via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://swaptoys.org/ckeditor/uploads/files/97055262679.pdf In PDF document text
    • http://sys-svinding.dk/userfiles/file/tukunurigogufe.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/bawam.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/xaragadebiviwu.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/wugigadudonenuxetobupubam.pdfIn PDF document text
    • http://aquatherm-graz.at/files/17393221114.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/77437070689.pdfIn PDF document text
    • https://ibericadearmerias.com/file/48262037340.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/pilevewijavubav.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/kifodefiteniwegimesadasev.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/j8mls9jct3nksdp6fgqn5pfv32/87898088339.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1fe77a2d7---wikidu.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f48d1cbc39---wuluwuloravudewukana.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/josawematafixapukixuz.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/31706007931.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/7671684900.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/51564165611.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/66650318655.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/89684651285.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/tudixonezonikup.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/boxepenamalofeju.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/gemidokuwukomaw.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613be6b608bf3---67398454976.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/vigedusitibidut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=live+wallpaper+doomPDF 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_off0000d99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99D 17924 bytes
SHA-256: 92eb054385d161270d6909bb151e422d4e52b3b2803de612e08de83043f1d3bd
font_01_sfnt_off000108b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B0 10292 bytes
SHA-256: aa9d5acaeb7f7bb75af8f38eedc50b7e0ad2e269d9fcc0dccc2ee8df403c22ee
font_02_sfnt_off00011fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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