Malicious PDF — malware analysis report

Static analysis result for SHA-256 537bfc2a358436cb…

MALICIOUS

PDF

108.2 KB Created: 2021-08-11 09:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c29bd6e8780d308ca27f0350063a3095 SHA-1: 01d32cacd0e2871564d0d2a3c15ad01e25532b98 SHA-256: 537bfc2a358436cbc22c056249f195c20ddf1e2045bc0fd160943583a7bd9f86
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites. The presence of these links, particularly those on compromised CMS uploads, suggests an attempt to distribute further malware or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/6d17104ab13de8b980d2d3841f5175fc/53698093236.pdf In PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/rpbgqhjfbc01pov7nujh0uj6rj/98372243082.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724a0b6609a---41429776427.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/2923093556.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fcbfc23d36e948983f725d59493769e8/39729972645.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd69fc2d1f---didolazokok.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/pefumekebamejutiju.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/kivodupa.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b613d3d6b---faravixoma.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/tevadulaf.pdfIn PDF document text
    • http://crystalcleanwindowsmn.com/clients/c/cc/cc5f591ab25ef7bbd7a205b431f39e57/File/netomopilotev.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/xuzetalolaxatugifawim.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/b9d68f84d51ce407b50c372dc532b699/69673262511.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/4aqgclcv9uu9v1ik10vipo64ot/nejadopusokedaxofipa.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b20ba811b0---fikodaxijuxidovafagexovi.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/vajizejepija.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/zokaredez.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705a2ede1bc---fikoganosapeg.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/fisituwimuremoguxupox.pdfIn PDF document text
    • http://vicorsupply.com/uploads/images//files/jejisifavu.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d81856c92---betogojomegakekiledu.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/41e9929108a0dccea978353975ad56d9/5559948406.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/moloriramenu.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882a9d72eb1---murul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=is+food+wars+season+3+going+to+be+dubbedPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13398 2776 bytes
SHA-256: f90778531abc720afb2ed39d28fc6ad17bb6862a50b74462dbb535d83e57c8c5
font_01_sfnt_off00013f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4B 18900 bytes
SHA-256: 09a4e328a7d57e3a8658d6b1c2f09da846a157bf3c976297ce24017052c728cf
font_02_sfnt_off000170b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170B1 10932 bytes
SHA-256: 08b7cec9548b85264a92850a5531cca691bc033fc4f055c20f2d754720e5f733
font_03_sfnt_off00018a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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