Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd4843b449a3da9…

MALICIOUS

PDF

86.1 KB Created: 2021-08-15 17:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a705fef3e6a24641c0d7b8929649df27 SHA-1: c2aa3f282c6acb500d31230a1219be89fbfe0f80 SHA-256: 9fd4843b449a3da946d24ba3b728139339bcfebf17b3ca7c97288ab34696074e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to potentially harmful content, possibly for phishing or SEO spam. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/6d4ae51f5293f4492837e4fcfc42243b/pifikurewazikoxosukatul.pdf In PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lofomejo.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9d535ab8d---boweludopiv.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609abe79a93f0---98303010732.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/jikozasawumukasupane.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/622ed654c2b24f6cdee8ad82c9099780/80093015980.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/7eaf34dafb312ea15ff68caea65a793f/gonake.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082a6cc8c63f---14059158881.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/68240963966.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c6df13957b1---sejamifez.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/dowavevutegirexiw.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160985939b86b9---28221629385.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/uvqvsajsvqsimrc7hgkrpcick0/66475611678.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/77261097413.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/vamowusiru.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/bd6dd545cbf2f112ba33d2b7fdc86381/kenirilufake.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/sikudutotevekavo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dbf4abc1d---xibajiwozamuxori.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/lubaginetikowolejewev.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210730042940.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/popivevotiwaseridemibemam.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/68311431515.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/pifemaf.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/golitanokibutogasikepuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=dyson+supersonic+hair+dryer+consumer+reportsPDF 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_off0000ed79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED79 10948 bytes
SHA-256: d3dd0349f0c542522a391254dc0df94b2402a5d3a16038a4276a2bb366e3fce4
font_01_sfnt_off000106b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECA 16744 bytes
SHA-256: dc2a4955cbe9ce05b19e82f2474cd09abdaebccf987384acddddd74bbcd7d4d5

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