Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9f24360b8f2350…

MALICIOUS

PDF

88.3 KB Created: 2021-09-23 02:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f7e105acf1e1a0e6be3b4344ceb68fd SHA-1: 57b1b6d33881f1b51611cb2e4bbad5e293a4c974 SHA-256: ae9f24360b8f23507c5f2935db6533918060faa948d31d6d6576e737da379310
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/e4lor3kl57e13gv6inps1js3d6/41542317439.pdf In PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/53821959111.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/39345438221.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/u8sqtn2lksmrvgpnnhkn7l5isb/45481392895.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/timiganux.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/30102903395.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/91214748027.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19263141110.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/51433060627.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb82ace888---93505560906.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/14619339746.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/pudumijasizav.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/49311473542.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/batewepozizewadilaxogivuz.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/22d484fcc9b78da6b91b56e4bd9a8c71/68343222170.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/polirukosubunagakidemila.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/terexinejuwanusa.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/xodajigekuzaj.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/32406901490.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9df4e190.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389c3654ef5---50938558585.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///9601790309.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/gaposaropudakafovutuzif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=tekkit+house+designsPDF 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_off0000ebcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 21052 bytes
SHA-256: e9117f928a9b94b49dfdd7de6014cb90b44c43a24ff83351876bb10fbf2ecf68
font_01_sfnt_off0001240e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240E 10376 bytes
SHA-256: ca37a2ea03dc4b11b5a308bfc96f4731afca944207873996356d00152aee0545
font_02_sfnt_off00013b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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