Malicious PDF — malware analysis report

Static analysis result for SHA-256 605a68ee3179a622…

MALICIOUS

PDF

83.2 KB Created: 2021-09-24 05:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2f7acabe39503772f71c95997c50fd2b SHA-1: daddca616efdc810d0fac8b183247af0a5a82943 SHA-256: 605a68ee3179a622a8362dedecba0286570ed41a84fddf8bfadabfa283a91f77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this pattern. No scripts were extracted, but the presence of external links and the overall detection suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/72020338060.pdf In PDF document text
    • http://fujavietnam.com/images/Download/29428643804.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/84264369262.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131f22a6b85f---95816575450.pdfIn PDF document text
    • https://fasleh.net/Files/files/fibevawifitonepab.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/tepujuxitizuk.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/85722784052.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/jumoxulotus.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/feniledurekidilevuxexa.pdfIn PDF document text
    • https://medtek.vn/storage/file/95768649330.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/43804616985.pdfIn PDF document text
    • http://nemochem.cn/upload/files/dubogo.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/87463915067.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/48730953463.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/8092659977.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/e41b84943e721811da54e3ddfa4e2184/runivatidutuliku.pdfIn PDF document text
    • http://ping-property.com/user_img/files/saguwelevujotanigoribu.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132519dc8f38---zifidobo.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/42894847867.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394d521193e---vawepavepinog.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/51452170322.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/36125042344.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/pavibeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=future+goku+vs+androidsPDF 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_off0000e209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE209 17480 bytes
SHA-256: 1da91b96590958b5ce0de6a967f5554ffbafa06cf54abfd4733bb4ba062c0320
font_01_sfnt_off00010f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5A 10612 bytes
SHA-256: d50c26465264b09986b5a99cba5294ca165acbdeca157035ec3ca7fb61efd92f
font_02_sfnt_off00012791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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