Malicious PDF — malware analysis report

Static analysis result for SHA-256 e735b45878264d5c…

MALICIOUS

PDF

91.9 KB Created: 2021-08-14 04:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd8b0d6c285bb53fe679c377701fae16 SHA-1: 02bf407446f81d0c19b1ec7955bea2b77bb42635 SHA-256: e735b45878264d5cad535fb1027a3b85744e79d8e62b01f7d096e2113eb42b2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to potentially compromised CMS upload directories or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristics point towards the use of embedded JavaScript for redirection or exploit execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://garglob.ru/uplcv?utm_term=new+tagalog+movies+free+watch+online PDF link annotation
    • https://ctners.com/ckfinder/userfiles/files/napatidoxe.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/95206453630.pdfIn PDF document text
    • https://numberonerevolution.it/file/85421778567.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/zadedonurodifobavaniben.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/10029399856.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf11bbf2b9---walaxaveji.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/22531203223.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/31042913886.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1il70efek1r2vjnsjt1f4mp12h/fobebowesakabumulotov.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dd075ed58---84991437721.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/aefpp82odc3hc6c66sn8msfe64/64554682183.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/11836547004.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/6698308484.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/xitaribafitamaruzavufivid.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/d2dbfce353aa6b3d89f86ab8d0aaecbe/wixakavivunodidaj.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/th81jd55fhra492tuqjh03nf0c/wedakaturevim.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/56285426301.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/cbd1ad4ee0b2b6fdefb51828a766418e/13012174237.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/69398897250.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/jetokisizoxemo.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/92723394151.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/nakuxaritefogexeve.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/lokikulefirugag.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac8925f082---47123675946.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_off0001016a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016A 10912 bytes
SHA-256: b0499cac4f71cb18960c8417691b0979a2d9ad757cc9e5f970c5efdf680b996a
font_01_sfnt_off00011a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A9 17172 bytes
SHA-256: c58f5dc2a1bd99c822cc6595422ff8c9aee16730cff9dd888294043a8004cf52

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