Malicious PDF — malware analysis report

Static analysis result for SHA-256 51468c2a3674f732…

MALICIOUS

PDF

75.9 KB Created: 2021-09-02 08:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd96486778a605c879324bca6f508bb7 SHA-1: 184325f117d066c6fa50d6cb7828b193b1982afb SHA-256: 51468c2a3674f732caa189619efc53ca0dd8cd79b3f3f2868d3d5078a34ddf5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or manipulate search engine results. The PDF structure and embedded links are indicative of a phishing or SEO poisoning attack.

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://daivupaint.com/img-chamthi/files/tawegafosevega.pdf In PDF document text
    • http://jumpstart.mobi/userfiles/file/9718735451.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160723a109739c---posuwibovusekibegup.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/vomudesubu.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/f306slp0fks84ahbv923bdcj2b/tumemusuruge.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608283787b1f2---tupuguwixumasofan.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/71399666089.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/42031018468.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160944ba424537---podizumudanonivopu.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/p6s5bvvqtl65dejvbrclurletc/wejajugutelisatowux.pdfIn PDF document text
    • https://elektrona.cz/files/file/jademiwex.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c937c15ad68---47162456993.pdfIn PDF document text
    • http://yjccnc.com/upload/files/49641315804.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/lafodiropobezigadoke.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32067479395.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f1727d2d3d---nisezowovajiru.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210611014457.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/8349277748.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/41204326162.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160889edb9fe11---94334520376.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/4230c3d27216c17908909666e5cc9745/56033428216.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e086f2d6b73c43b79b6a5af9edb42b5/jegozisegejib.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/54860308507.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/wawudeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=taxi+with+driverPDF 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_off0000c36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36D 10124 bytes
SHA-256: c1a9faa6bef8fc28b1977c7d10a28ba82ec84fba63538932cefa560506c73364
font_01_sfnt_off0000da34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA34 18616 bytes
SHA-256: 17044f75f5e8ed97d0fa3b983f4cdabb08ecd75013399b244bf3d1b681984e30
font_02_sfnt_off00010a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1