Malicious PDF — malware analysis report

Static analysis result for SHA-256 68d8be1c2b971653…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 14:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 89b059bcfac9c6aa0042f459e9a0f5c6 SHA-1: 0438c71179517207e50d3f3f0b4842d8b27ce57b SHA-256: 68d8be1c2b97165328cce7fe2ae358a8dba8fe69046b57f1fc1cb26aa15ad430
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL heuristics point towards an attempt to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nolimitscenter.be/peausitive/images/FCKeditor/file/velat.pdf In PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/sinuvimifeluvuvevawolozut.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/mirerexukexozesipunejerij.pdfIn PDF document text
    • http://byecook.com/ckupload/files/zabidutatiga.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/tevefemafejolebipatew.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/xesovulifu.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d19d13cff3---nunapuzogujojijoza.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/bb47f53277683e48febecb8fd10fe0bd/17551691618.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/18336828282.pdfIn PDF document text
    • https://combrooncom.com/contents//files/jovoda.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/79157436237.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/0e6ded6791ee8f9f08fe3a0e58de7f38/keburevufebolimajo.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/jv1hbdd8kjfcf06jaku23k4fgg/15161128921.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f12ea489809---58988532464.pdfIn PDF document text
    • https://songuryazilim.com/calisma2/files/uploads/72821907590.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/97817835102.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607142c07d2b7---11797650334.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/73237474983.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096fbba0761b---65420484060.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee33459ffd---30415349462.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/9756841582.pdfIn PDF document text
    • http://girl0229960192.com/upload/users/files/fipejaj.pdfIn PDF document text
    • http://blccy.com/userfiles/files/lasuretiwabut.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/68055457150.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/ximofizazajosusox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=upgrade+an+automatic+car+driving+licence+to+a+manual+onePDF 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_off0000de19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE19 10864 bytes
SHA-256: 7a0b18b6ab3461fc363bfdb32eebbd13cff7a1e60086a538df09b1406d139b6f
font_01_sfnt_off0000f6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 16980 bytes
SHA-256: 6ad9920d847fb9e2fccce26555262929edab3527c271ffb7e997096bcd499f6e
font_02_sfnt_off00012292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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