Malicious PDF — malware analysis report

Static analysis result for SHA-256 d487f56a7a2d002b…

MALICIOUS

PDF

74.4 KB Created: 2021-09-25 07:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f532d0e2ed0d0abb96e0a23a4e9ecfde SHA-1: 77908683992eb50a16855f7edce633c6a7fbe42c SHA-256: d487f56a7a2d002bbc24ca57f7b5f2e02c7fe1ed13a2b438ad54b269d7b34f6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of a link farm used for phishing or distributing further malware. The heuristic firings suggest the document is designed to exploit users by directing them to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://wastran.ru/uplcv?utm_term=go+princess+precure+movie PDF link annotation
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614505c92ed43---denilusipuditizalivupem.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/68755235903.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/vawobujod.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614de48e834ff---daxugiwanul.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/jujaxupez.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/fulepowukuraxevopu.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b54cb3e8ce---98004711815.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210904101358.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/sakemade.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/98959972750.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/linodidupilotuzatumuze.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/bebomamizemujifisu.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/52566109597.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44277861116.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/69149309422.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/betifoxuxag.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/dejemisixoji.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/75375957438.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210916020628.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/17009772411.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/52318740780.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/mawak.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/remikejagejada.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/kimexazetidajuwa.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372bdf568ac---jalitel.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/puzosato.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210908193354.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_off0000b940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB940 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD157 10436 bytes
SHA-256: c1f85e1df2776542e961f3d27a522bbc7506937883832f0636e504f9ddddd655
font_02_sfnt_off0000e8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 19108 bytes
SHA-256: 78e800bf44bdd2ee9b99dfec7e8dbb3c0cf7170d1db58681f9afc677177a6b2f

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