Malicious PDF — malware analysis report

Static analysis result for SHA-256 26723a4d679ef1e3…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 07:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4b53631c12c62f7522dba3caeacf6abd SHA-1: c672bb9247c7a735e855f04cf8967c1ad0280f68 SHA-256: 26723a4d679ef1e3d94f9c283c1cfb1534faff0fdd51e0ac11b747fba1213538
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the presence of numerous external links indicates an attempt to redirect the user to malicious sites.

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://big-blue-bus.com/pics/fotos/1/file/zotetowiwoxiguzitan.pdf In PDF document text
    • http://club-integra.ru/userfiles/file/fesizofapavizanujunoloj.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/nizonunadoxowesorevivoxum.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/69242568864.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130253222c06---gumamafazixuzeg.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614371edc2fff---xefiximudaperupifapidawa.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/xinadifipelulebudepino.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144dafa6ea15---2432932407.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/temapuxesajerekov.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/pabovawafupupix.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb062294e6---wefavawofalizoz.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16146b5258b060---redomufunanikemi.pdfIn PDF document text
    • http://vkts.se/userfiles/file/visavakutuvokafiv.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/2902833053.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/meremuv.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/67406140673.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414f8ea8e7d---wudipifusob.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/sirokufa.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/xanexevijususefomirutixow.pdfIn PDF document text
    • https://sergiomauri.com/images/file/gilezezunugozonarororoxox.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/zabodafazusame.pdfIn PDF document text
    • https://projetovm.com/uploads/files/gulomebidugezopizivaderun.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/41282660253.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/nodikexugowawixebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=transfer+gallery+from+android+to+androidPDF 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_off0000d607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD607 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1E 10772 bytes
SHA-256: 80011966018c3725f3be68ea6614831ab0b05e0f85d293e8aa329311a28aa7c9
font_02_sfnt_off000106b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 18828 bytes
SHA-256: 5541dbe6c31b9976174743dc56ea55cc280a3753d25c8cc9219a6906788567a7

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