Malicious PDF — malware analysis report

Static analysis result for SHA-256 b423f3c0e55d93d6…

MALICIOUS

PDF

80.2 KB Created: 2021-07-13 13:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c8e62fb597d196a4d9a87589c591d306 SHA-1: 8ed0c8ba8f10dd5d02d64464f2812e28926edfea SHA-256: b423f3c0e55d93d6fe5d0e36ece88aa4a88224a2969b8118c109ea55593afe0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting services, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://laborke.ru/uplcv?utm_term=discount+christmas+wrapping+paper PDF link annotation
    • https://getadoc.in/ckfinder/userfiles/files/leximijudepuk.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/51e5aa06fb1a5fb27f4c498a61ddeb41/70586413839.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bd21e6f5a---33559140823.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/nativezobariduwesataz.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/73250616576.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/5fa502d1f99135e1dc66c363fee75c24/muvaxoneb.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/63ea26b3faf5f3d84a6a1f49db09d978/vuvabowutewavo.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/lupiba.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/56042061105.pdfIn PDF document text
    • http://22743333.com/userfiles/files/13018293347.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/74451e657d7db29e44a31a45f7c12b59/89414302276.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/g5gmgm8p2vr9dolahfm2qbsarg/9154159053.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/98162668456.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/63694606477.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/17214820465.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887a97456f7---65204909663.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/faribapizab.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d30b368536---18785931804.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/33231c9b2a83ed2ecd703a4b3a0e373c/52334251631.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/21555912447.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/a045d6638e7028759ec18266eb7f5ffa/nagubapukunizikevibu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/iqhs3bpk414bsa3349ofvpjgd0/logizipilevekojufiropoj.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_off0000d4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 10964 bytes
SHA-256: b827fbd3e8cf9cc33ee72d9cc41a91566b5d05f27574ea6c39ed35667d4ab78b
font_02_sfnt_off0001062e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 16916 bytes
SHA-256: 89a729fc0f47c2c5798525f72a72ed393b42012785320b1779e77549c08866f2

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