Malicious PDF — malware analysis report

Static analysis result for SHA-256 b155607175abd13e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 21:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dda719ef8438e5b859d4b5100d801967 SHA-1: 63764f95f738feee2271ef62378fbad66013b120 SHA-256: b155607175abd13e1194f25010bccb1d77ecb70c65155dfba872b1858296b8f4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://nomylo.ru/uplcv?utm_term=sequences+worksheet+ks3+pdf PDF link annotation
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4547179873---lubulanimivabefomurokamo.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/jawedaxotusibegese.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/nm9p06emm0gag2t1d87vag140t/80014067129.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/32004441933.pdfIn macro / runtime command snippet
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dd7caf1e3---jamudovo.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/judejakafuvufizorotufiwig.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/4r16r65iabfc1o7esjfvq5o5ou/revopogiwazosogoz.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/86129626033.pdfIn PDF document text
    • http://wenxuezj.com/images/File/91324944362.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/6g72jemooujohou043bfjidgqn/5613436855.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dafb69f1d---vigekigafu.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021080222310268.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/gfo639b9tresckfi3f4hhjhbf5/situgelebugitelidon.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f7b104819---xeviz.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/farilutirubomu.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/sojopabadezoxebiziv.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/42154602153.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/nepenomifiwofe.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d3054911aac---50718773086.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/junivitukabitopu.pdfIn PDF document text
    • https://evenimenIn macro / runtime command snippet
    • 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_off0000d67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67F 11088 bytes
SHA-256: 0568c29126cdcc03bbc0698fa214397517a3c6db69ff9e99a05e9d87500be61e
font_01_sfnt_off0000f02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02F 17580 bytes
SHA-256: 89a6a224c8ae59f2e27764d9f8afa098932646ad30d81ad0a4578aa1817f0088
font_02_sfnt_off00011d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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