Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f969527becaa8c5…

MALICIOUS

PDF

75.7 KB Created: 2021-06-26 21:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 585a1dfdd00e340e8c94ffe43ae630e0 SHA-1: f35c81c9497e02aaddeb30509ad48cc26a2336b1 SHA-256: 4f969527becaa8c5235e7e4fedef16bcc413b5b0509e737e30acb2f99c5dc49b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to obscure the true destination. The presence of 'utm_term' parameters in some URLs indicates an attempt at SEO manipulation or tracking. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083041d3680d---saxekigazalofejekopisu.pdf In PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/73d8cc9464c5477d8ce29a2fcac541e3/kexomolixodavonof.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/fisegaxipisedekel.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43e1fbae4a---13829704816.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ab04ab1a1---51447682639.pdfIn PDF document text
    • https://chp-travel.ir/data/file/xerew.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609feedab42fd---sujemedivumuzuvi.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe652af50d---likole.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac90d927fdc---wezabojosururekoruwodu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/60cb4c9da76910dee0b7168e26bd69d7/porewiduxabufesepogepek.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/3d3e0e183abe35624caf9b15ee28eda3/sexarazomen.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/27737453300.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cb75c01da4d---53931361734.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ou8apvgj2lumrkg8lbribb244c/jojuvuki.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/71182971214.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/zuvokutujufegazilofud.pdfIn PDF document text
    • https://bachson.net/upload/file/wewoxiwupeje.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/xasevazawazuziweni.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cf43e13420c4e32f72c5042658303345/31435284924.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/ovliccf07sd4fnkjthoik490dl/pakawokopofagulurod.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a93a112f4---tifogoxavagusizameru.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/vukal.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/aae62593f282fd7b8c3f043fa5df7138/5460822393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=stealing+the+fire+from+heaven+stephen+mace+pdfPDF 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_off0000c39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB4 11208 bytes
SHA-256: 3af3f95a39a2990e6a3ebdccba8a2ecb3df2a46907f866be54eb69ae4c299111
font_02_sfnt_off0000f58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 16764 bytes
SHA-256: 9ee153d0b031559106b31b495df30201dac2746dcd90ec84af2e7df5c3583f9e