Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ffbb9403128f505…

MALICIOUS

PDF

77.2 KB Created: 2021-09-07 21:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 701b1e405cd4e9bd6ec9afa12b3da96a SHA-1: a475df2ce4451e8a1d37f8adb823d437bdbe8cf5 SHA-256: 3ffbb9403128f505e2f54595569ab064d0655f5af457653639882439b63f6f2e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of 'utm_term' parameters suggests an attempt to track user engagement with these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=tuck+everlasting+vocabulary+pdf PDF link annotation
    • http://interiorconsignments.com/media/file/58684853370.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/xidarovakemawotobexor.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16121766ad362b---sujoxaxiwexobemavezagaxub.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/37284350616.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/sekuwesano.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16303551357227.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/922f4c5b34e62a1260343793bd49ab74/busidusoruzedon.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5658da54d---17587194951.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a72aeb0864---mewojofazute.pdfIn PDF document text
    • https://mavibusiness.it/file/31729479269.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/fa2b92151beca5fe3521485c045ded2e/bujogafupararafugedit.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/xadimurefaranaxom.pdfIn PDF document text
    • http://amdind.com/userfiles/file/tuwuze.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f473952077---25880853393.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/50107206587.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f466db76d---61220435967.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db08cc4c98---julewiwamo.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af5f6d8b9a0---kogepusatevurexu.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/34548127006.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/72893810079.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108facbeff8c---javipafigavirewutuwasav.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/f4970d627fb8b7b977a23aa949707eae/68772283977.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/39431470576.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_off0000c3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D0 19296 bytes
SHA-256: ec5c2157bf6ae4403cd9f6bc222ecc02902f4e0ebee0e8d959936bb4738eb8fe
font_01_sfnt_off0000f4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC5 11272 bytes
SHA-256: 65e78d0d89a862eae6e34a615b02987dc88c0818e0578a56d48b39118d375062

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