Malicious PDF — malware analysis report

Static analysis result for SHA-256 57096b9700147e49…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 18:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc363a26827175c3a22b622ea997c8cb SHA-1: 051e9d30959c06186fd9b3476efeb789fed0dfb3 SHA-256: 57096b9700147e496f49e575007cd63681c5c8d4aa754e965c0a80ba3c8a6533
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and embedded URLs suggest a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=esp+hack+pubg+mobile+android+apk+download PDF link annotation
    • https://spa-salon.ru/ckfinder/userfiles/files/6261697484.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210916_B0D7F9E03E9636CD.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/vizuboluge.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/54711419844.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/pijageboz.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/xoradizixugodadogefive.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/1382efd1bdba646181aba86b096d9d4a/mexugapabukifobirafoged.pdfIn PDF document text
    • http://ketex.com/trcgp/ckfinder/userfiles/files/61929719271.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416a97524a4---96189941913.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/pipaxekubimat.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/1lqunad5sr3v9cr3amo3nhosje/29637212768.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/89964394177.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/padagetivoxutage.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210903210806.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/mupewuseludubonege.pdfIn PDF document text
    • https://senfina.top/uploads/files/11519630558.pdfIn PDF document text
    • http://synowka.pl/galeria/file/wapuzuvi.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/gusizinadogikijanokokem.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/fitevukimeleze.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/ketisuwowigudalidon.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/46130878610.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/38941782493.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132bb1218a23---79605308130.pdfIn PDF document text
    • http://theponghop.com/upload/files/4373821395.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_off0000d2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FF 18208 bytes
SHA-256: 9b588bbc97b9d9f894ffb42eff5021caa47c74aad8924515762fe1d80208eb70
font_01_sfnt_off00010223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10223 11264 bytes
SHA-256: 3d1e762f7cd37de63c2fd4588d9e6be8d170110fd4d4c7a11b93228178031b43
font_02_sfnt_off00011bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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