Malicious PDF — malware analysis report

Static analysis result for SHA-256 c287e08cfff54f11…

MALICIOUS

PDF

70.6 KB Created: 2021-09-29 07:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 70ba4bb633b6bafd197cfab1acd80f8b SHA-1: fb045eab439df9f39793c86bc4f79d9574902520 SHA-256: c287e08cfff54f11942cc81f2b10dc6f6ec63bb91d8fab5ab0635e1a008b1886
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate an attempt to direct users to potentially harmful content. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://laborke.ru/uplcv?utm_term=1+thessalonians+questions+and+answers+pdf PDF link annotation
    • http://drumlockingclamp.com/FCK_Editor_Images/files/31821391799.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/66968366951.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/36648272381.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16148b45e8f794---zagoturixikinaduzi.pdfIn PDF document text
    • https://cargobull.cz/res/file/zojenabozadekasugese.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327fc5a67f9---75064536125.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/zixexozevufake.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/nogobofuvoj.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/65534296049.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/xivexubomogexiganuzor.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/bepiredupivubavux.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161340e14a2917---jesunufatuwagofiful.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/darenikorapamov.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/65098770235.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/46552994959.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/pedivegezumesebefaka.pdfIn PDF document text
    • http://asfalon.com/__files/file/pesilofuxuzoze.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/8332916176578959f4b60197bfc392d0/pasanatojurewuwufalivosun.pdfIn PDF document text
    • http://wmsone.com/eimages/file/numukuwupuvida.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/795bc8ff31db5aa01ae712b2f958019a/paxotunazasutefutuwepo.pdfIn PDF document text
    • https://projetovm.com/uploads/files/38024462324.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/29679235818.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/pegowej.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/54621579777.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/vigimijatolopokobot.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_off0000b216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB216 16412 bytes
SHA-256: 5c18cbd2773c943968576be317edf6aa9926b1c0b452c68a6492ce48ec63a279
font_01_sfnt_off0000dbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD3 10880 bytes
SHA-256: 05caeaff40abc2b77e8c83668e07a4d6ca14a835ea3029cd6ea248ea83d63650
font_02_sfnt_off0000f4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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