Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3061dc04cac7abc…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 10:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1ff98ff2704fd8d6d81405cbce99febd SHA-1: 76111a45e058a73dc21b117f807e9efbd4f05132 SHA-256: b3061dc04cac7abc736cd32afdecdf37e071a0543da11f2b2edac1094340a513
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external domains, some of which are hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to obscure the final malicious destination or distribute various payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://safires.cz/ckfinder/userfiles/files/3832310720.pdf In PDF document text
    • https://nadinerogger.ch/userfiles/files/faduvajewujuvagi.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/20297581995.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9c0a4e168---sijitenipuziv.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/b28d6d647b0d8cd55cfd46b42939c72b/fifuromujagifak.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/jusegiravinorasexa.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/9625635387.pdfIn PDF document text
    • http://195exim.com/datas/files/93485324368.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/28975028801.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/cr5kb0vl3hifdcdlnfe0r6c195/gosidobixozike.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/5247960676.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d88506901ff---20619385193.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/mepogowolasa.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/newixipupo.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/butotipogugesugeb.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/xefitodajebi.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/58545462357.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/fewinilok.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af701851939---10652711124.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/57632754020.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/86171196910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=free+rc+sailboat+plans+pdfPDF 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_off0000d4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D1 10728 bytes
SHA-256: 09a98f7e7de62213a216302ec2c89854b8ac23e561314cd946737d29e00a8a64
font_01_sfnt_off0000ed4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4A 17764 bytes
SHA-256: e7899f788eb7164252e96557446d028e41129aa1a42ca156aa25b6ffc81b66aa
font_02_sfnt_off00011b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1