Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b4867734aee4cc…

MALICIOUS

PDF

84.1 KB Created: 2021-07-14 04:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f6cb22c3681f91d8efd811c2cf41b7e6 SHA-1: e3b435f9d1c5e21f11891b4d21ef82f1d496a11a SHA-256: d7b4867734aee4cc3c45daa41c6f94b7f58666c345d9b5da9f33586149ed1035
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to numerous distinct hosts, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sigep60s-ncbeta.com/clients/44785/File/40657270490.pdf In PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/b45iovojhfcfcok46e4vboi3i8/konumirofatejigudakugi.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/kokegemuso.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608978ac049c4---fasewumanekebotetuwigi.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8bef76b4a---55588304060.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/41546864837.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/85304701099.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/zagigijijenekizujod.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/36c4b4e5ba3dd2ef1279f9b2b050ce2e/rivozimimuwed.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/51627502809.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/9409446231.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3fcfab042---66227478360.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a87f0b83ff0---xawet.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/jesuxutasiz.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7b05d1628f653dcfe66ad72ac55661af/88038789081.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/80794805452.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/9be044d7d58a33908ed15ca854a1135c/96820114312.pdfIn PDF document text
    • http://unseretochter.com/images/file/5548593039.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/25d552ce8e4347683725ade207ef4689/58689994521.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/30393c27bdcc043afe2ff07ee338fc87/5193720623.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/57814948269.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/42kmbue01i6fsisdb3f70pd1f2/sevesibixukofazewibizaluv.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8585759ef3---29050625087.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8095b7f0b---61498607917.pdfIn PDF document text
    • http://veivel.com/userfiles/file/funizekexotojukelebelajav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=calculate+the+mechanical+advantage+of+a+leverPDF 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_off0000e4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A9 17412 bytes
SHA-256: 34a9cc60cc78aaf51fd6f275f00eb0160431f1e12b570f4523b899c43ad2eac7
font_01_sfnt_off000111c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C5 10952 bytes
SHA-256: 45ece7cf88e198f98035ad37236a112454599e48b135b433b35af905b8715198
font_02_sfnt_off00012acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1