Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b9df4266878e6c…

MALICIOUS

PDF

90.4 KB Created: 2021-09-07 02:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8f41e5d9f812bd6281c65fccc50f65ab SHA-1: 8e87e88c1272511292fb753a8e2015b91f023bac SHA-256: 53b9df4266878e6c23a95d8ec7bc39d12ea915d0163ab93851384ed8baff4298
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination and leverage potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081e1078719e---wiruvage.pdf In PDF document text
    • https://ifbscalidad.eus/files/galeria/files/gorusonezenal.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/vifavixuwanigemasag.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/166967751.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f09c0b314---95336998746.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/98745302029.pdfIn PDF document text
    • https://zhansq.cn/upload/file/fewavixawenaxewujifajep.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b61961e3d46---17937161856.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/nifix.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/vematemobuwogar.pdfIn PDF document text
    • https://tigaintan.com/contents//files/97531110776.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/fuwijisugixa.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/naxom.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/51736989668.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a73e90d05---xaveruliza.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/2967545986.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7589e0550---80161410424.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/91605b1cda477c71b21855708ad8a5c6/94295573582.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/43449871012.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/buluvoxidulesesiresig.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e671663570---bufusimujujeguzis.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/dulikevapolonofavipu.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a84568cdb3---xoraj.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/30148811367.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080262a5b73d---23307097475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=orgoglio+e+pregiudizio+pdf+downloadPDF 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_off0000f949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF949 18988 bytes
SHA-256: 5245afad906c6b538a8d8ffb5c8883b77ee025c6f12d88db3ed72cba6ee65cc6
font_01_sfnt_off00012b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001435b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1435B 10676 bytes
SHA-256: f67cfc2c6ddc3eccb706a81c0dabde8cee00d122af24f14657490e247e6ae142

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