Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97980b560e2a143…

MALICIOUS

PDF

87.6 KB Created: 2021-06-27 20:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a311bf267c7ecd1b711fd67b3f50fe7b SHA-1: 127417647ebb819abaa44975a089af8112aa0d14 SHA-256: a97980b560e2a143d8da993e4b139de5a89d8f2d3201263400a4518f11c1b1c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of external links indicate it's likely a phishing lure or a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://pabrikangka.com/contents//files/guputevi.pdf
    • http://waukeganeast1980.com/clients/877304/File/12283813237.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd5f4c6d8f---xotumubifinazumaliligibeb.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75ddb1d5ec---ladapidibinotodusizat.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8101ccf1b0c180e95f05d22b22b3cfdc/94235246401.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b50a607dbdb---tadopininerenaselozugurug.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/mshj0gl7sd3dblj3buo0va2okb/kunobanininexizezu.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff0e47ca64---polawojesawagek.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd9e6b3806---99911773295.pdf
    • http://sarljarry.fr/userfiles/file/funejeluximekok.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3979ca185---34731799633.pdf
    • http://ecotrans.vn/upload/userfiles/files/pabepivozu.pdf
    • http://agcslohian.com/userfiles/file/tirigezovibufexubesel.pdf
    • https://mobilieroccasion.fr/uploads/file/parazawasagabapoweseguzid.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/800e80d9990d11d373b46e5c53970715/jomizenefujofufotok.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/gb9e3j0rnrp3ro3c1eed3s3c11/81650575031.pdf
    • http://group-anons.ru/userfiles/files/pikikeginoluwijezego.pdf
    • http://www.egavilanes.com/ckfinder/userfiles/files/11533076284.pdf
    • https://menu2uplus.com/images/file/fozegaleli.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/eecd1fdef61f8863d11ff36071887c32/68689261195.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/f6f66a9fa4592c6e0a0ade12ff70cf28/5484580104.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b80ac57f41---borirubekusekasoxibozug.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/2koihvmq9dt7lueihh2f7gkrq8/pezatijoluwe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+computer+changed+the+world
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f128.bin
b5f7cdc29ee764d021d8f987ef033e99fd0f42960bf01ec5e50d2b1b5977ce80
pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 10880 bytes
font_01_sfnt_off000109e8.bin
b3cad4bef6b7c02cfcbb4c86f1039c79e92846c4a7d1f89580b2a92f260df756
pdf-font-stream PDF embedded font (sfnt) at offset 0x109E8 17600 bytes
font_02_sfnt_off00013746.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13746 16792 bytes