Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d934561c6a683a1…

MALICIOUS

PDF

82.6 KB Created: 2021-09-24 11:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee0c7f2c64dccf337f8fcd27bfd89b5c SHA-1: e8c5c3f4de0df22a133263862493176ea09ab6f5 SHA-256: 8d934561c6a683a1e9403de61758e889dfa3d91e8779c5f780caba4a6012b2d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=mirzapur+season+2+telugu+movierulz PDF link annotation
    • http://vencedor.coop/images/admin/file/nimowufudusek.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/mm5nlua5fuo6h4enb3k8rahrt2/67908443157.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/kezaxekutonuruferaz.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/kewegogifikimidatedukuv.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/34085333582.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/43746532163.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/95503943102.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/vokesevazolukowarev.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/99124380652.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/42981341410.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/bosolapawujufe.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/79171804346.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb779933a3---63043149934.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161491f8a4a347---56142090246.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/kuvirenep.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/61300281264.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/66247044321.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff83e35434---zutifewokerifokovizej.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/31108228083.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/80476226259.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/85875429780.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d62876af96---pudijase.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/pibabotuximo.pdfIn PDF document text
    • http://sdds.be/userfiles/file/rokokekamavojixavaso.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/71796528216.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_off0000dcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF1 17932 bytes
SHA-256: 3d54dd1fa63d29e8318c32fec45642666d6d772b742616baa3f9b9d25971561e
font_01_sfnt_off00010b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12391 10932 bytes
SHA-256: ce450f0453a4b9da860801cf2d88f6fa6973087b3b43bb099377cfcb7fd4d093