Malicious PDF — malware analysis report

Static analysis result for SHA-256 875203fdde5cde9d…

MALICIOUS

PDF

77.4 KB Created: 2021-08-28 12:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c37f433c52701f2e9a62ebc5b7c552cf SHA-1: 3b43a8e6b783e061ecf1f3b82640f8cae10aeb53 SHA-256: 875203fdde5cde9d94f6c9e2604984834e069c9d4943d65d816e6a94155a261f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d385578a7a---29578179497.pdf In PDF document text
    • http://abwvictory.com/uploads/files/lezurokapujarigamotum.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/wewad.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/juluvarudefogotutabaveje.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/40865843693.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f50c210b2---18092872966.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/33474043121.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/192755e63600de96ed6a23f850bbd4a5/vedega.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/82612314576.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090322163fef---demogatopujowe.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/lolofasovasomowovotope.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/81ba4a0dd4cb869ec14e2d8a9c0ea223/fanesajexikozitenemekide.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096cc4011c16---takebir.pdfIn PDF document text
    • http://poiskvod.ru/images/file/84883040866.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/14056755853.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210702_8D74A2D5B4FB753E.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ps0i0j0bk9gq7a80lfv1n0hdv2/39385890940.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021051800280956.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/diwidasusumevigipi.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/xosazubemonadefajesero.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/62d12d3efac0793d228d2d43ddcce952/jekukow.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/runilujizimikuvalufe.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/46d723781bfbe2f8c5d4f7ad111ca607/2027557145.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fe1a8c9d699---zobasekoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=not+a+barrier+to+effective+communicationPDF 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_off0000ce4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4C 15944 bytes
SHA-256: 1b6bf52503b871371597894e7b371ef78493fdda09f141750c6dceb0309abb4d
font_01_sfnt_off0000f711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF711 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F28 10568 bytes
SHA-256: c787969182e6937b06d7f8775869ac783dc69894157e5db1667f689253be9e5e

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