Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7ea69bb3fe52e3…

MALICIOUS

PDF

82.5 KB Created: 2021-10-07 05:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 293f6ac8d40b5c7ea9362e08c0f3a1a7 SHA-1: 85fb3393f4bbf700e0272c03a072c29a648a052c SHA-256: 9b7ea69bb3fe52e3c3ebf6944f7bf27a85472b2e6443dcaf7b96295f77c5d08d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content or for SEO manipulation. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://fmi.lu/userfiles/files/raxixuzapesuvoxipenovasu.pdf In PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/7069213159.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/sanariluzesozazodaf.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/92654412745.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446ac03415d---92900177331.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/kafekuxilisibuxidepoxo.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/nabixupi.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/56966487427.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/sedodovorute.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/refokebuxelukenuwirimide.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/36364863815.pdfIn PDF document text
    • http://yanartextil.com/firma/files/nokozir.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/33680581097.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/89938479985.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/61306420679.pdfIn PDF document text
    • http://thietkevang.com/upload/files/90704324395.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130199fcca66---vewomiwemagodolujez.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/lolepatopi.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/60191790952.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/sibelofubepetoraxanig.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/7458880467.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b747105d05---gezawilozivok.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/88793620820.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/gilejeforova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=19+month+old+babbling+but+not+talkingPDF 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_off0000d847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 19780 bytes
SHA-256: 6bc1e8223e6fc67ba4a13ffe3202b5ee7894689a152fcbc240b93b80590cf5b0
font_02_sfnt_off00012475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12475 10748 bytes
SHA-256: 3c6fca6258ab52e504fabed99c4fd886f33650876975ffb8c6254b04bae132e2

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