Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a8ef9342bf2432…

MALICIOUS

PDF

85.0 KB Created: 2021-08-15 03:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1541c65a2d5eeea54daa61096f45b864 SHA-1: f53cef446567b3906fdefb624183e9adaa5ba528 SHA-256: 80a8ef9342bf2432940a01b90f49ba5ace02e6a8d0972b3c31e97ea3d9eeb6cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of external URIs and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=brittany+perille+the+ultimate+program+pdf+free PDF link annotation
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/afe063dd62b08dbe81173355a0bab5b4/xaburovodibebojip.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/64890188069.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef68ad9147---kilifadisezegom.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/3659adeaaa2c7af18f8adfd6ce58ac0e/domumagazijatibubilalid.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/jrc2o7cpjgeljjebi1u90odbej/nilawesebo.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/i9a6tle6o6cgubupfit7ks6i5l/44646211730.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a651137f02d---poxusakod.pdfIn PDF document text
    • http://katheran.com/clients/55933/File/26611616403.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d42bbb58d0---koxifuwatebugu.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/kinixap.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/tefarunakogowamozudofexe.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8791f39ac---11137378499.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/42479936088.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8db52a3f1---64872570828.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210728055131.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/jetopuzaxovu.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/jalifusorefowuvifa.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/58805433794.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/xatedovojak.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/silifer.pdfIn PDF document text
    • https://mollis.rs//files/27270986116.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/rejakijijekimotagub.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97bb33dcad---83053124311.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/9118587548.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_off0000e3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AA 11044 bytes
SHA-256: 6c53b9834460f6bf7ea04340b79c9643dc492cb0408e39182a8e9ab8507a720b
font_01_sfnt_off0000fcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF4 18776 bytes
SHA-256: f6a1bf39de0a368f8403324f7716e2939c679de4d4fd2b7642feba087c3d8a4b
font_02_sfnt_off00012e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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