Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a22d681682c7aa…

MALICIOUS

PDF

95.4 KB Created: 2021-09-05 19:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 972381d95d2089cd62c44ee1413719b4 SHA-1: 6fc954d5773f3a8b2134103229807ec3b14f6aa2 SHA-256: 18a22d681682c7aa803e9fa77a1dec2c99c006cad9bb10c5b5d6496ed2e814f5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting. Heuristics indicate this is a link farm, likely intended to lure users to phishing sites or download further malware. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://dongamold.com/fckeditor/upload_files/file/lizuregokupakamadodixati.pdf In PDF document text
    • http://fygl.net/uploads/file/222057026241.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/vqcf0r4gmido19o4g9q0pvqduh/wimonegikok.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a7183375192---webofofoxopajumipaninuxa.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16115c9755d5e8---57566389398.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/37389989936.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/werabonu.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad4172eef4---tuxekubem.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/18221657671.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160fd7167685a2---zisijotagudugivoworanali.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4a1e5105d---nunadiwozitugozo.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/tomuwurugefali.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/refipe.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/032fbf77996e97bec716aa5eebcd63b0/dimosubegufun.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160967eb0ef9e5---81616973425.pdfIn PDF document text
    • http://xsteelstock.com/d/files/gerevavu.pdfIn PDF document text
    • https://le27.fr/docs/file/80702999979.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/malunipofoj.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-30/20210630160304990696.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610610e101641---buxesuj.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/34255163572.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/47060784367.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d65e35f33c---79141442515.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/67274708469.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/lekakixorotasatakudof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=trapezius+flap+pdfPDF 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_off00010d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D11 10292 bytes
SHA-256: afdb6bc882237ed9e77fe310613b07ee75958eefe205f2c3e2baafdfa193f2ad
font_01_sfnt_off00012457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12457 19612 bytes
SHA-256: 70eaa900e00a1f1f6d9de1022f47be91eb555ece552d507025e3e252257d4224
font_02_sfnt_off0001582e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1582E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1