Malicious PDF — malware analysis report

Static analysis result for SHA-256 29df11dfb25a6356…

MALICIOUS

PDF

73.8 KB Created: 2021-09-15 17:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 317c15b6635647f381411dcd883f66f3 SHA-1: 9c216967e57f674dfaeedbdab93fc1198ca4edc2 SHA-256: 29df11dfb25a635680da492f96e7d3151dcf15464541404c5f3cfffa8613827c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and link farm heuristic indicate an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://savitaco.com/uploads/images/files/96561424075.pdf In PDF document text
    • http://carzip.biz/files/uploads/files/noverisewevaz.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/funoverob.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7dd42e59---vixiseti.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/57129928569.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/63618097164.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1bb8e4d0d---66950923763.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///36726966191.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/34294980010.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59198105913.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210906165327.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141c2be32c1e---zesapesixilasevezuka.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/dewovelazezadisexu.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/27296108072.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/jezeja.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/kinodonuxa.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130caf5297ff---47804695604.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/56153694555.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/91375923389.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/tuwirapobole.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/jizero.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/82464717304.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/82500996350.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/27516876161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=call+of+duty+advanced+warfare+pc+torrentPDF 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_off0000bd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD79 10752 bytes
SHA-256: 7433852a84c9c55831cc2d6b16e57ccbbe93a87084048d8b6e3154b940cb54c2
font_01_sfnt_off0000d678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD678 16672 bytes
SHA-256: 665a12d8eb396c777bca6ce2f364f1fc2ae7d1fd53fffb5e0d99d600af18ba80
font_02_sfnt_off00010126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1