Malicious PDF — malware analysis report

Static analysis result for SHA-256 25207ce968c6d75d…

MALICIOUS

PDF

74.3 KB Created: 2021-09-25 21:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01318d8f96212cceb2756bcc5c0a7ee7 SHA-1: 2889b1b222b1b6bdd5cde8bea47693202e3aa6b5 SHA-256: 25207ce968c6d75de9ec856e5fd5718116679b9e4a6a7003ec61a8a15629629c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS uploads and disposable domains. The presence of these links suggests an attempt to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://whatproperty.ng/ckfinder/userfiles/files/zemobefaxanuzopaz.pdf In PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/57655125769.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/kidutobifi.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/2ddc84fc23ff4b7f1cddffb598584760/mulizovezul.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/5636909475.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/8942239335.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/witebazorakonakisu.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/ronavifoforole.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/7dd6e1dfe11ddff3af3727394ba1673e/radalonulaxotusipi.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/28887795913.pdfIn PDF document text
    • https://quasar.mago.ro/ckfinder/userfiles/files/zitepojupojemoso.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613211670b6ab---38923067237.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/napiwubujapevelasojebujeb.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/nimuwovatumefegisuv.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/40275568372.pdfIn PDF document text
    • http://budropol.de/Upload/file/mupadijutuxanoziwobi.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/natibajekarakidugujitobol.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/wepewusogu.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/jinoriduguzovunofalol.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/70759394844.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/nubumamowilaxuwuniz.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/38918877833.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/23594791401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=kim+playboy+photoshootPDF 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_off0000bb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4B 10428 bytes
SHA-256: a3040d4fde8101921cef412a029398a27d3a4389b871e20a6856b70fc7b8abd9
font_01_sfnt_off0000d2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AC 19284 bytes
SHA-256: b9da96fff3c05dd92bd4b07d1d88d2b1d53c77f5d1b4ec15a8ec0107fd67d598
font_02_sfnt_off000104a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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