Malicious PDF — malware analysis report

Static analysis result for SHA-256 29cd464a26a6eed6…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 03:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa3aeefddbaa8a3bf888c5155701efbc SHA-1: 405fda4d52136c997ca58cb4a0c984861aa08f53 SHA-256: 29cd464a26a6eed62cfc64fa763b821133acccdda3e45973e27a6504670e203f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable hosting. The primary function appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=nighthawk+ac1750+router+manual PDF link annotation
    • http://pozitron-s.ru/userfiles/file/tabekunakuzewuvusoxuvibor.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/t3b3ep5l8snifmnsjbrotbbiqe/famavemekipekata.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab39e4538ac---68375206718.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609425c9031e1---vavelefoladodimukurum.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/tibogu.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/723165876.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/xiwikupoxeritup.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/paluworujup.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/77778466475.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/xaxixakinazowu.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/uom4tqdsk8iu5kbrec03vvrmt3/wunepuxumimiwokejup.pdfIn PDF document text
    • http://hotechike.com/files/files/xamigabozugorutudemob.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/57023692930.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4f9b7dcbb185769712bb56b0999ee201/63157179852.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/4740291661c7d0d1d310b717cf54e862/54606500445.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/7eaac1a390c3eaa2ec00948d5499e6bb/gasepozaxuxivif.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/kawapokenisupegefage.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a437dc74ab---77951791344.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/sakadategezuvifademug.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/77987256045.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b70f28b3ca---tudapenejusowetut.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/40932def26551acfd75e8faded669ab5/66109164055.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/ralobepolu.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_off0000dd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD01 16952 bytes
SHA-256: 8e50a26a1cd1a1959e1703f0f211ffb1bb8f595b680d314e62013ea88841b78d
font_01_sfnt_off0001091c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091C 11124 bytes
SHA-256: 7877358545e06a84bfaa843cb2bd8d0daefa1009703369708eceef45ce9df31b
font_02_sfnt_off0001231e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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