Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab828fe70e382bd3…

MALICIOUS

PDF

116.0 KB Created: 2021-08-23 19:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: adb3422b87aff3ffa64338d8950c11a0 SHA-1: a474c28941f77fb90c83f5eff7cc1bbc2e98af9f SHA-256: ab828fe70e382bd334d207876e1063dc72ae12e2c7dbbdf1559bab4f7fef2b5f
156 Risk Score

Malware Insights

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

The sample is a malicious PDF, as confirmed by ClamAV and ML detection. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting domains, suggesting an attempt to redirect users to phishing or malware download pages. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to obscure the true destination through numerous redirects and varied hosting. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://oniceh.ru/uplcv?utm_term=collinear+points+coordinate+geometry PDF link annotation
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/35d65c78bcee02fb947233d5b893a05b/japiz.pdfIn PDF document text
    • http://momsystem.ru/public/file/67740133634.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/bcffd3595aa4425d3de325ca91289474/bezoworijaboxabezin.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd082bd0ba---munepukiv.pdfIn PDF document text
    • http://clintonseniorhighclassof77.com/clients/e/ec/ec6cde7faca09d53f5ba1fe44cd32e38/File/54564742692.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/27851223515.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/59629959821.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/14821041997.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/logozu.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/60281315109.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160798b5d5e6c5---54340483740.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc171e4377---45938452470.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23c50da7f---17274962962.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/637vbradm4pohd179a6j3je1sf/92186766225.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/8b99e0bf731117dda037095ea8a06306/54391115407.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b87ed2ceb---julelipitepagesu.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/81500435577.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26601e5ab4---5934853234.pdfIn PDF document text
    • https://csn-alliance.com/data/files/93045617521.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/51336880267.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14798 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
font_01_sfnt_off00015cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CC0 19192 bytes
SHA-256: 923b5a098d85ce6209a4b50f38ecdd18be59b4faae7e600e26458f4da10718d8
font_02_sfnt_off00018f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001a798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A798 11004 bytes
SHA-256: d191b50ada28fc4e86b468b8f3b3476553757ba5b2bc6766bb95e4810d3faf38

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