Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21fdee8d31d4886…

MALICIOUS

PDF

87.8 KB Created: 2021-07-19 08:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 629c0d5c7790e121ef5a04a11f796212 SHA-1: d887aafb8030d6bda678c6306fe969354b63039d SHA-256: d21fdee8d31d4886de7aeadb573129c9ebb5fe719cc04b8fed2f8d2b3bdbca41
156 Risk Score

Malware Insights

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

The file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised websites, suggesting it is used to redirect users to malicious content or phishing sites. The PDF's structure and the presence of multiple links to potentially compromised CMS uploads support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://careersourceokaloosawalton.com/files/public/18217511429.pdf In PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/31bf429d6960f4baaa13e196db1fae5a/92624216019.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/10322272367.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5900b54b5---voguvetazekagitegixuj.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/56181248562.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/90060039273.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/fcd835adf0ed5927c22e7f40801975a9/37705463213.pdfIn PDF document text
    • http://classtool.info/upload/files/99123987394.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609159756c5c7---13337924063.pdfIn PDF document text
    • http://merwepizza.com/upload/file/70636508991.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021050411150473499.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d47f645e0---ruzubanopesop.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/riselagowisepikukubekig.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b74388d328---28584368392.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/mjqfkd6e1ui9aq8hl87fc49ger/rufoperovafo.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160880237c0d07---jilitivi.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/q5vjrmdhu69c3pq6n91b54dp8c/77794737375.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078e585c0308---koxolu.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/likiperugezakew.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/2142353423.pdfIn PDF document text
    • http://svx.su/ffile/file/32514568495.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/81583314735.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/mibopez.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53cfae211e---96737356144.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/53b626d617e41e0b994db08aa6decd6b/vafubepuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=applied+mathematics+for+physical+chemistryPDF 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_off0000f2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C3 10876 bytes
SHA-256: 1d9180971f9872139f1c084cdad6c48489c85cb56a24ac59e0ea75fa0249c0ae
font_01_sfnt_off00010bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF1 17468 bytes
SHA-256: 2b7150c2de0b13051246ddfe64e31584da089393fad4eb347ee22eb6d8690285
font_02_sfnt_off00013978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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