Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2dcbd9cabd9218f…

MALICIOUS

PDF

89.0 KB Created: 2021-07-16 17:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 245b81b1b1ba1113ba3d5f33a318584e SHA-1: d851f16f6fb78676bb987d50705ab32ca4376b6e SHA-256: f2dcbd9cabd9218f230bce730e536ec801fccab65eec83e0021c008ed9ab8b4a
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the PDF's primary purpose is to facilitate access to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://apvn.info/userfiles/file/51271497347.pdf In PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gowate.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/nabozafaxaro.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/43efbd2bdb0156886057de8aef66fc53/gamovegutujerarakax.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/8c73cd5ac0f55d9348a7ec495adcba69/53992650666.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/ripomikuvusamo.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/fagomibilufoguv.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/nakitifijok.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/72483830742.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe0d563762---ligujuraxiranukizavowe.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a379919f625---13574936010.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/guluj.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/xibevibureziraduz.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/32395737344.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cb27aac85f5---15153783700.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16201952984668.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/55203081757.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/b1a3c9e2e5229b4c413f8bd8df10f482/darupavaxubetune.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/gejuja.pdfIn PDF document text
    • http://waypl.pl/upload/File/23818615452.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210625145040.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/kixili.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d58d30e05a---19860731199.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc19808944---sonexovekezi.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a649faacc78---jajuzinizivokitefarakewux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=notes+from+a+dirty+old+man+pdfPDF 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_off0000f4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D9 19808 bytes
SHA-256: 66de14fcd4e3c47f541c0c1924b6166fa6bba1c27e6b0d24eee6af8110684893
font_01_sfnt_off0001259d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259D 10748 bytes
SHA-256: daeb6d6bf9a36778ba5eab1faa4645b99a43e468e43119830925f3e20d140366
font_02_sfnt_off00013e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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