Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b85371e9f99c4d…

MALICIOUS

PDF

87.9 KB Created: 2021-09-01 17:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8b33b646a9ac74b7c962d57de4465920 SHA-1: 88054e802d5d0a254ed025b31dd22872586c68a1 SHA-256: e7b85371e9f99c4d5706b7fdccb58796e7e93a118d246f0aec9cb303a9809e0d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting domains. The embedded URLs suggest an attempt to lure victims to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://huntic.ru/uplcv?utm_term=what+is+a+binary+compound+in+chemistry PDF link annotation
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bb45a4ef3---66951310511.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/31ddlegjl7lcbjjb62o4bun74r/43531126177.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960e282ff71---lulezejojivamalebuzef.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec96a304d3b---15291426109.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/89264607876.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f72fecc7c6---mupilosubepoza.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/26451737353.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/80951206490.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a34e0e16c8a---rixabetel.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/912b24fc52c4170a4542f0f5241efc78/runefudebosigimarakiv.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/14395807185.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/katadabegu.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc01eb62140---lagujinevopereniwipob.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160908cf742ccd---11646358414.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/kavadeva.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/gudafimufowar.pdfIn PDF document text
    • https://jambukuning.com/contents//files/zufodaxekowetikapapir.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/befotexaroden.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/78248341973.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/lopunajenifuzabe.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/78299412886.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/najijemipemibejigujep.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/jalejubexasabivemodijo.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/datizomo.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_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 11080 bytes
SHA-256: 145d5ce50a0bbe504cc7e8faf7cd2c38984b953714a33cbb2d2f2ff91846da7e
font_01_sfnt_off000106ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EC 19272 bytes
SHA-256: 82211ac10425ba45f3691c17f8f4e1d267b81d09f8a7a6b8750eec7fa579b796
font_02_sfnt_off000138a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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