Malicious PDF — malware analysis report

Static analysis result for SHA-256 6924132c75863bf3…

MALICIOUS

PDF

177.6 KB Created: 2021-07-30 13:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: efade953c7fbd10b7c415f51b67c528b SHA-1: fe45d5cc3164fb5ac92b14edf24205b64666e7f6 SHA-256: 6924132c75863bf3c5b43f4d8fced3c7f2f5ba3607085d865129f84b6dd6af76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bf59df127---3087572435.pdf In PDF document text
    • https://allcreaturesinc.com/files/files/xudukigexego.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021062301050766.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882fc11b776---78904253273.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4d167b2d4a---majowawa.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/28711492135.pdfIn PDF document text
    • http://metrokentakifinan.com/resimler/files/pizumisituku.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/44045ec0e86e000f7b971fec788273d9/16638301800.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050309575067.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/xegifinibolesitax.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/354bca7af77786239f813c4974ae2f3e/tusosageku.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8a62b7ae0421378e9b9a946b7598f3c8/rezivikufa.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/de6d7f52097b5be66e1ba8ab9a495a08/5969816020.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609482f8122ce---nagus.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/50389166966.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d54f502f90---57500937613.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0a05a54fa---nikoxupuwuwedaragilop.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/90263221521.pdfIn PDF document text
    • http://hpmcfamilyreunion1968.com/clients/83891/File/rekakatunugoganuwinupegi.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/idckh482tttivfis93vslsl2i0/36058263239.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/83507799096.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2299845082---mopesovofel.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b8086fd9b84---93126744134.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/zawetanef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+make+song+id+on+robloxPDF 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_off0002532a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2532A 19168 bytes
SHA-256: 1c8a8c371157044a9cdd8546de561efabf596afed4f22770b1e065aaa25daa2a
font_01_sfnt_off00028514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28514 11000 bytes
SHA-256: c0b402da9a240813e4c8e01670ba8ceef3ffcb07c2b32c2a9aaf025be1758de6
font_02_sfnt_off00029e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29E6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1