Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a892d2df33c7fa…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 09:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2e27f5b15e8de0d342d000ce8b34dd9e SHA-1: 5ac7c12a961e2b9a109e96ce3428d96f4bae83ee SHA-256: d6a892d2df33c7fa169734615dc2711465d5b27662668723489c130938682975
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. It contains numerous embedded URLs that form a link farm, many pointing to compromised WordPress sites. These links are likely intended to redirect users to malicious content or phishing pages.

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://wastran.ru/uplcv?utm_term=little+big+snake+online+free PDF link annotation
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9733a1102---jidikefiwozududogo.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/tugulewomibakimaruw.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f6457563c---jalegosoleni.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a3614f9da---xuxinil.pdfIn PDF document text
    • http://modern-pro.ru/files/file/lifefenogemepanul.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/tavexowikamivojazok.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/jalevudures.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/vdq9q44oafj4ded54e6m2qan1i/mukuzonob.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/vawazukusotowixerej.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/gozozuja.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/xexofalatudikaki.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/14841003762.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/99130114424.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/j8pog2rcifbukjaf92qsqovu1f/fofarakusapibamenujawubu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/lpra5mtil4vco3st7vb3cobt73/11135808195.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/59638203501.pdfIn PDF document text
    • http://grimastone.ru/files/mejigafizewesefazekuraza.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/fenimanarapu.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/57799523560.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/bafakamukizotivotorazag.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0fa14441eccfb10ab2f6e19158346439/josefazatoji.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/68158559570.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_off0000dc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3F 10580 bytes
SHA-256: 98bfa104b3d0c5c895b45fd8a480a781e299449cdaa79213365b7dbb36b920fe
font_01_sfnt_off0000f47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 18064 bytes
SHA-256: 18fcb0ce2279f23a0712b2ccd254c838d2f6a04432d21a22c4509fb3236e8aae
font_02_sfnt_off0001226b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1