Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e23d5f1c3fab979…

MALICIOUS

PDF

95.2 KB Created: 2021-08-07 02:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e22d5522ac5f45f877123177efba517a SHA-1: 7b3eeef4f5028e511e1c2cb1ebbfb4d69a40a3f7 SHA-256: 7e23d5f1c3fab9792b7c2b2358a686f62e50326d0c2720a296c97b2147e3429a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS upload storage. This suggests an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://toyotaquangninh.org/data/dulieu/files/85603943802.pdf In PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160982b9707dbd---zubad.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/77475004180.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/tamenidotatis.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/49792992332.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609189481ed45---38843171030.pdfIn PDF document text
    • http://xtra360.net/campannas/file/5005156449.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cffd67567f---56034896842.pdfIn PDF document text
    • http://springbook.no/files/71507950967.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/nopilok.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/wexumazajilakelixepotufo.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/27720736719.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/kanumuxibex.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/suwunedafudedimedavomij.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bagamugekoxajufakarofubi.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210720051126_oks81b.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610db93097edf---wapomejopojoveno.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/57045971794.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/c4docs1i3otv6t36q5n7ok5ncd/xoxos.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/78009421706.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/laxoxajirakumirafaro.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/35116793723.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/037b88fa3d3607ebe4c653842b86dd06/85642632300.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/m0kgpaopoat959bjrk3kmibg9v/66773442028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=exercicios+sobre+a+segunda+revolu%C3%A7%C3%A3o+industrial+8+anoPDF 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_off000108c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C2 11608 bytes
SHA-256: cb6d0ac14fca70802393a636d1c9f7317a986fa60dca840feee068c1a7301c08
font_01_sfnt_off0001239b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239B 19356 bytes
SHA-256: 932da3c20d66b2e58e44f0c110372d660f2e919e8d3a8811ce9b862e3262dc5f
font_02_sfnt_off00015288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15288 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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