Malicious PDF — malware analysis report

Static analysis result for SHA-256 2726f0e6ce82f9e7…

MALICIOUS

PDF

77.5 KB Created: 2021-07-13 22:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f1250f3195d6585134353c6211adc4e3 SHA-1: ad5eb9f64c1c02c9e364b54c139f33482caecd82 SHA-256: 2726f0e6ce82f9e7bfd2c87f58732cecc4b103fb7d806ecfbd9de8e5f6767fdb
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to various domains, including those hosted on compromised WordPress sites and disposable hosting, suggesting an attempt to lure users to potentially malicious content. The PDF structure and embedded URLs strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://smidgel.ru/uplcv?utm_term=11th+class+physics+guide PDF link annotation
    • http://mploa.com/clients/2/2c/2ccb326c3583e393996f575e36ee3974/File/vajebeviwixuvarunabuj.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/zuvemiwe.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160740c6d9ee66---fijexijizadumej.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/23069084710.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/gaxavujew.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857ba83fc53---42854785807.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c427ac62f48---35760780913.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b991032cf8d---gojepulesibowebive.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/9759546611.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83d9ec8521---47759718169.pdfIn PDF document text
    • http://islandpointfl.com/userimages/xuzujepiwaduvimisemin.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8d3345c4c---rupurivonawewokuzok.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3140df6d4---7719638573.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e65027b2859---vaxepakifu.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/9bef485370a29f630861941efbc6b768/56104261410.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/0ee62d08fb35cfff2dc4ef1b5f54d730/6601216272.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/14049952910.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210701/file/16251229366391.pdfIn PDF document text
    • http://alkanboya.com/files/file///67613252814.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ecb63c33f9255713cb82982644e7bb19/81158462745.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/21efspvcq3g9t2embftevco340/66225934323.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/43505954466.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_off0000cd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE517 10640 bytes
SHA-256: 840736a4aed40f7a78e94d905554e7df4906390d3a200fd37b2411e741ece880
font_02_sfnt_off0000fd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD70 16852 bytes
SHA-256: 1d16bf88a0869e856cca632fa3af28c85905a658097ff12a2cf333767e695253