Malicious PDF — malware analysis report

Static analysis result for SHA-256 b685bf36cc1aeca2…

MALICIOUS

PDF

85.7 KB Created: 2021-09-12 21:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f77a7e9bef1aa1167ee1489be80d2bae SHA-1: ec714f728ac861ba7437d951e7e2f5ec9b59c23d SHA-256: b685bf36cc1aeca264f6100c0d22580a8858735b90e688ca338dbb2b0d014778
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting. The PDF's structure and embedded links suggest it's designed to redirect users to external, untrusted resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://etyekilovarda.hu/userfiles/file/34961197325.pdf In PDF document text
    • http://klinok-saintp.ru/files/menisago.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b99b7cddcb---forutosufidajowoda.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/37228950275.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139da8a6308c---pimufinenap.pdfIn PDF document text
    • http://vuason.vn/upload/files/7114238432.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/novivomojafetuxezur.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109031244419346.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/84663923801.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/jozipagajus.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/54031946869.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/mubetalilekuvo.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/zuvidupujadikugagotiveji.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ofobqdkh69rfg9n3vdgq3me94g/tikofokumame.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/lififakubufujolezipopu.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-5/20210905021507996896.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/fexadazedibunami.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/peganuriwosawibeleg.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f22de5533d---nokunoxi.pdfIn PDF document text
    • http://pololanna.com/user_img/files/74734922778.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/gajegeriburatokakefu.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/soxuse.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26675360416.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/bojajosururumubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=marvel+games+for+androidPDF 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_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 10660 bytes
SHA-256: 0370ce89c0aff2c04dcaa482d754c81e4d9beebbbbb645c0fd0cec510133088e
font_01_sfnt_off000104c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 17380 bytes
SHA-256: 326b04dfc51fcfaa29b82d32c7ed10bad48a62bb9d03344c5d6e641c7d974920
font_02_sfnt_off0001314a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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