Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c8e35a343e0b25…

MALICIOUS

PDF

92.1 KB Created: 2021-07-16 20:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4832bd9b0b88c00cc0826ede5082f422 SHA-1: 0458d965ed5a33515da23af0f938bb68ae8a134b SHA-256: 81c8e35a343e0b25ffba541183ec2e03bde530e6a530db7ac7b9d55372fe28ce
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or SEO poisoning campaign. The embedded URLs, while numerous, do not appear to directly execute code but serve as lures to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609799a4595dc---85619399141.pdf In PDF document text
    • http://springbook.no/files/13017058075.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/fuludiwuvebifapeput.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/libuvarosumanupojugunojo.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/3b64a484b6979f938c3e5d9c37e90a44/51468076328.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0j2vdqmi5vcolip8dh1vms1132/dosupaf.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/44816182616.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/q2a7vgr5vsvvg5hknk4pied7a4/76673867966.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c1834a31a---kikamovup.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/nidanuvokenuk.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/pivumivijifaxeruno.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb7cbae741---43952302921.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/2f11c003c4c5852a5c3bed6e6121ca3d/fibowajulig.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/8f6ce089709f357e4fedbbe6f6adefdd/sajomefokuku.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/pusutir.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/22983905358.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/sufivigufesajumikijo.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/80200dfb765c0b0c1bcd0fab9298ae66/bokenuvamebupiwivukevega.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/37899605299.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/59031110329.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/15b7192027a609f20857b2e71d126bd2/diletikezosuwab.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dc21e4652---rebuvulabe.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/rokonowumirowoketakinixap.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df6e1e67ed0---4031300479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sd+movies+point+chhichhorePDF 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_off000106b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECA 16788 bytes
SHA-256: 24c96b09dc361fb70218278657a0e8ad2d16850efd1487809aaa19b46a4fb643
font_02_sfnt_off00014acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ACC 10712 bytes
SHA-256: abd83bfc558b67ece4cc0b161c80335023b4a5df5869e98a93b8db406cd7e005

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