Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d79a7c36a8e750d…

MALICIOUS

PDF

75.7 KB Created: 2021-07-07 11:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: aee28f975d0e17bb0e94bb24869629c7 SHA-1: dfd76b6376db261908f050268c50739c8a07445b SHA-256: 5d79a7c36a8e750d561e569e042331da7eb26cc789d90fe8a93058e44327eac6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c72dbcc91c0---dolozubutimaduxofupizeput.pdf In PDF document text
    • https://airbays.com/userfiles/file/73272679804.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e41ae954ae5---33880754140.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/zamotixebiti.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/xanumozowutorukojopa.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/eb7575a5d3bb3401c41adbd5aeca1e41/14543065157.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607844bf1edd5---bigirofafavukomatalurunef.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609c30b18416a---10574708810.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cdfb7f687---56936206906.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/80b8b762d675faf3051e09974f634f2f/wotopofisusobopisebebidaz.pdfIn PDF document text
    • http://ridendo.cz/files/file/limolazoxivumubadidegiva.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16083c5cae1d90---80307794610.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/66817135091.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca33018e61---30508376290.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/zevumatuvuropawi.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/rofagixadeninizika.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/begufixukevegef.pdfIn PDF document text
    • http://tele-video.ru/upload/files/19902731548.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a0910c355---jinemupotuwobomakegikap.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///sutozijasi.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/n23tkevmro0f29gnug5r7qm1nu/jonijiluxifevatekafuse.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/togafibomis.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/zirakini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=function+operations+and+composition+worksheetPDF 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_off0000c062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC062 17528 bytes
SHA-256: 8d1d6df8739aae82caa90a032ebd441128956a1cc0ed5b9c41edf5c4a2a9f1b5
font_01_sfnt_off0000eec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 10988 bytes
SHA-256: f5027389b39d267f96a1291b8877537b00fbf2dfbcefe8e40c378e498d5222b7
font_02_sfnt_off0001082d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1