Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fde44203a6960b5…

MALICIOUS

PDF

80.5 KB Created: 2021-10-16 18:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f148cd37c122b10863541980b388df81 SHA-1: 2ea003ccc49c8c1f2f6e3177f6f7a11b4802fa01 SHA-256: 7fde44203a6960b5490b2b5b8020d9ee76c3160de212339e51b363b70a8c1797
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads. This pattern is commonly used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://mgrenginiai.lt/ckfinder/userfiles/files/kuwaxetu.pdf In PDF document text
    • https://kawanmto.com/contents/files/lufujexuwafu.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/7815450766.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/evavgfcbv5f5eght6dh7eqblks/29987922036.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/6720320998.pdfIn PDF document text
    • http://turatabor.hu/media/36814109415.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/41935820359.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090502224373499.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/7641420684.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/229630da58130d19c19a890573c8e7bf/57147864844.pdfIn PDF document text
    • http://akademibt.com/resimler/files/24720897707.pdfIn PDF document text
    • http://www.puhito.hu/uploads/legimugefipir.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161598073613ca---muwusevoxudigowikosekan.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/tiwosomiripiwefojitipofu.pdfIn PDF document text
    • http://sdtr.mdrap.ro/fckeditor/uploads/file/31508191403.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/juxikaz.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/kuzujufigozexanigunavo.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/rovemarovulenozomase.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/e6btsmtqeftcn8rcj5ae5npgo9/fozijuxekibabafemoxe.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210919_B12B501F2981730C.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/91339866403.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/61211144196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/EqozwcbAC44/uplcv?utm_term=2.66+kg+in+pounds+and+ouncesPDF 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_off0000d73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73E 16768 bytes
SHA-256: 9f8644e8e12ed8eb8243bc5da351240dc21ae0539bcaa91950fdef2aa98a8d91
font_01_sfnt_off000102f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F7 10892 bytes
SHA-256: 18ad40cc6844f5caa7eeefd66a64303feaa4f429e6dbd23fff31ef5786ff8227
font_02_sfnt_off00011c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1