Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e77993c8e0350b…

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 09:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8994ecd0cf255da99075c063c525e8ae SHA-1: cd7bd1953f191675e65885d36446c2f472c0180e SHA-256: 85e77993c8e0350bd344c40562d1b9815445c8f788b40e866f90dcf61159127a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various websites, including compromised CMS uploads and potentially scam-related content, as evidenced by the numerous extracted URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The primary goal appears to be directing users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=procreate+for+android+apk PDF link annotation
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/1a4edef59c7eefa8fc6f754877e49f75/30459379074.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/71754561155.pdfIn PDF document text
    • http://pneusmarene.it/images/file/josirikunuxubiliz.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/wozotuvawokapumegu.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613428a800ca5---90073472930.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://leeandrewdavison.com/download/powanikudaguxapogotasarig.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/42344669317.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/duforazejita.pdfIn PDF document text
    • https://polandpools.com/contents/files/19485762951.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/12369470278.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/makagugizonibotetet.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/73111770699.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/vokam.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/jogoxavivewozaluzeluzajug.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/72374383286.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/bitozazutopivexenoz.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161307b6242998---puvijafabaxuruwewa.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/952cc7c9a15244219edc56a9a4fa11bb/98526438109.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/supefiradofekenaposu.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/wudinevemiwasamipusoba.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/58159557775.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/tuzasiso.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/kuruzojurazaxeledav.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/nadapinuxoxixe.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_off0000de4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4A 17312 bytes
SHA-256: 2b1eb9c89f4eeebbf75b8684c8fbcfef23a9f0216da54e0537ce623a7f9b25f1
font_01_sfnt_off00010abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABB 10492 bytes
SHA-256: 6ba5210d1601757bfb4a9898be08b74b7f3aad1e6492e1c82a29bfb6127db0f3
font_02_sfnt_off000122ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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