Malicious PDF — malware analysis report

Static analysis result for SHA-256 7818de4eb39ae3d7…

MALICIOUS

PDF

95.8 KB Created: 2021-06-27 03:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 99022e3ce49ed2adc1a19819fffaa27b SHA-1: 3adc6bf25cf805ad2cb74276964dfe17819ebc3f SHA-256: 7818de4eb39ae3d7dc46ec6c8d17438fb8ac1c2c8a14fe002f84cbf8926e6d4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607802054f1b2---fosawikaridiler.pdf In PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/91419087711.pdfIn PDF document text
    • https://mytopics.it/uploads/file/92394696373.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/nemoperek.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/85666268738.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/27073f446a458e3b463f537087c38b49/39404444847.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/82654303090.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac499f68502---87930484124.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d66b01aea---78448611414.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/80760078070.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2f2dbbc176c363e96610e98120d44de3/67209351548.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddeb299407---kelebulonowazudosaro.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/10edd47305bd635d80cafb1b16e32333/wetapisowerajavoxoded.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/39067095578.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/lumiluri.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4e6bda8af0fd8cd1a0bbadddc097751a/suretagodagusax.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4eea184b04---88116567168.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/wovazejuturelezarifadaxo.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/bc00585e8d6c376e1e0d80b94bf9cff9/xomuvojo.pdfIn PDF document text
    • https://aedwea.com/upload/foto/gigetitaroregosidogojevex.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/1f99411e5e1dc1231ce1c8b29b66aac7/84645132880.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/xidapijonisorebebe.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/63356108388.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/213dcb222d8d954ab880a13f65164ba0/moluwunufe.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/7795ab3210fe1fc155e32cc072f42fef/joxopurakenejatirogenotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+get+buff+fast+at+homePDF 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_off000113d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D1 17132 bytes
SHA-256: 9e49478e4bebd94e5bf34f9c6dadce4f9cb8b5e87c53bdf8e52d7e5cb9272a80
font_01_sfnt_off00013ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFC 10636 bytes
SHA-256: bc2f605acacf5a354830374bf4d05b3286bc8c37122158cc51e7ac1ffea3d573
font_02_sfnt_off00015873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1