Malicious PDF — malware analysis report

Static analysis result for SHA-256 5087f769f92b0e77…

MALICIOUS

PDF

89.4 KB Created: 2021-06-29 23:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 790671c36bd4b50cce3fb1252a7fc9c7 SHA-1: 797630645dda886bef037c34ac7c421ec8e70790 SHA-256: 5087f769f92b0e77e61aefbbb4098dd5b4bb864e02e7175c63a938600980f538
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics strongly suggest this file is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ea0ac753a---nuvajemoxonuvemozole.pdf In PDF document text
    • http://dyglas.com/userData/board/file/28827806464.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/17867488088.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/pevelaweju.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/nevoworuvubeketuke.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/t27hl3ban8dc3botihuklfesv3/durujajituteguliziwuxami.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/81657373755.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/runilavitikitumibiburan.pdfIn PDF document text
    • http://technocom.pl/editor/file/93269234943.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/e2d66ce08e0b8456a9c2702f31b1c44d/16966913225.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c347389069---7717260453.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/19244475029.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d901ef956---99523866796.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/tijuvaludifemi.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755a230584f---riwabozugugozuroxuluz.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/94f18e43e68d5b8eb76f686a6cde7571/12493055873.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/3569157436.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/34548742717.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607db15ee6deb---pilexikomavezufegalusul.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/43e10733136eb7546c69620832634244/84323873142.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814cd6d68f9---kosinivibodupovogupegefav.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/pexokogum.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/85a36e5ecdc0bd08e140c61e1eb2c40b/gatagakifikuboz.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c017d331306---8384276629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=data+centric+security+architecturePDF 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_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001112a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112A 10376 bytes
SHA-256: 62d7911b2d2c53ce9bb76b59045c710e0ba88adc88de1225b7822c9a0899a28e
font_02_sfnt_off000128a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A0 17540 bytes
SHA-256: 44d6ffdf480a1916cf527873d0384ddc1396da1739318007301822b5d8b763f3

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