Malicious PDF — malware analysis report

Static analysis result for SHA-256 be0177b75092145d…

MALICIOUS

PDF

86.1 KB Created: 2021-08-20 11:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 29d88cfd9891970e4569c4bf3feba84c SHA-1: d6aaf218fe0ba128d3eb0a940e92d87ff051a592 SHA-256: be0177b75092145dd3569792e6e6bec5ceb2017a31a50cd5454004e167760e85
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised CMS upload directories. The PDF structure and embedded links suggest an attempt to manipulate search engine results or direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/8706401914.pdf In PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/76937860955.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3b341504b---86599807810.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/pofat.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/auljlg610g706ml6u02300koqj/62920950597.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/nugurujozobebalogesoru.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202108191331439625.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/81105456557.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/jozonuna.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/76626072359.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/mopomesetubafox.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/vtvv1o45r4i36e5tqf56ph8q75/mitefarelimepepakimatose.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/zarixo.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210510/file/kakabezonimijimixol.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/xogabifusi.pdfIn PDF document text
    • http://coatsofarms.com.au/ckfinder/userfiles/files/kevivodukuxanot.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160babb5de07e7---jokinejejinozoxuxumuvun.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/33809772961.pdfIn PDF document text
    • https://people11people.com/uploads/File/jenumubirafemusadekefe.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70871739603.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16087da2d3a9b4---pemutogetifi.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/34546868398.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/dumemaj.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/6662735848.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/4ff097ad24701e4f25e473b0cecf5e8a/mulumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=acta+constitutiva+de+una+empresa+para+llenar+pdfPDF 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_off0000e8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F6 17576 bytes
SHA-256: d9c3b1f53f3517d091171463daa7aa122c0d02925ffde47474fc0a62379d341a
font_01_sfnt_off000115d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEC 10928 bytes
SHA-256: a0a4ebe305c8b4df8219e5e04a37da72ae7d7b0a459ffde2db3015730d5f330b