Malicious PDF — malware analysis report

Static analysis result for SHA-256 07d4ca3e17e40458…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 01:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1e40324b5e5e5df99e51d39cba752273 SHA-1: 986c92e244a8c44011b39910c75f5943853298ee SHA-256: 07d4ca3e17e40458ae2bd580460303cb2d4ddd58c1b10b6029e11fa44e4ed921
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage, with multiple URLs hosted on potentially disposable domains. While no scripts were extracted, the nature of the link farm suggests an attempt to direct users to malicious content, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/acc635e72deaf79a7a89f7b2d0cf018e/wudota.pdf In PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/72507821071.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5eb88b17f---14044259344.pdfIn PDF document text
    • http://unseretochter.ch/images/file/36849951859.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a8be48f2b---xowakijexade.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/zidekokozibevorerumuxiw.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607564952c818---xigavosuraka.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075f75fb610a---99464377619.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/d4d7e9acd2a6d22dc849000c558d8a8f/wiwininamezojo.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/28783813427.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160ab87fb9956b---medizukifexum.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/majuzovejotepev.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/tq30u4dfp0gekgupaon5iq01ph/zitexan.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/tamiropanoragexezajusuv.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afac48195fd---gopizitudat.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/65462145974.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/35557070139.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/61369747220.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/55807363831.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/sulix.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/56072184400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+embed+a+pdf+file+into+an+excel+cellPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20921c2b2c---90405351469.pdfIn PDF document text
    • 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_off0000d838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD838 17432 bytes
SHA-256: 970688534dc3903a7cbb92460e40180f7ea1e470f022f7d8a2b53d2fb5a929d2
font_01_sfnt_off000104d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D8 10832 bytes
SHA-256: c669b5995190e54ea3f817f391f4a6e243607e5135d6679ec2d6998673fb7aa5
font_02_sfnt_off00011d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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