Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f7fe68e18a56f0…

MALICIOUS

PDF

80.4 KB Created: 2021-07-22 11:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 881d57b1b3efb71c188cf369f0facfa5 SHA-1: 55459877c455817a2820d9a44931d95b6a1233f5 SHA-256: 97f7fe68e18a56f01494e5bb1e066b76debacd6c6b0b242bafdc17e25d27a5ab
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of these links suggests an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9782

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/95282219532.pdf In PDF document text
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/fegulerunazetufil.pdfIn PDF document text
    • http://rideco.hu/upload/file/mulepasinoburulejerovos.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/bejigusewudofinabo.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc953a1f1c---sosovevofosigad.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/duwefimobuv.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e82ed4580637b80ec72fbc0884e02960/91876290928.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a0e9cc25679a2fb4ee9941844e6a4e92/49516248419.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/zofiwiziluwever.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9d1979de0---forulupopinozejurosigivam.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d715ef6d5---kawosapoguvi.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/8bbfad0cd925febc4c7edb53294cba89/60369988249.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/86231162620.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/7cbd2258439edf32487817ba2a576561/74805457353.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f46b16fa6---57856419317.pdfIn PDF document text
    • http://apsons.eu/files/file/76150960450.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/7460434058.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/palojixevijusilu.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/1a30742bc2857c2ab0041642d8239a7a/tafabanufagamu.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/dodukukoko.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/42530703520.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/radudefo.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/3c146e1f8caca5cae1f9757c03cb94a0/basug.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160794755bea8e---dolodezevamelubibik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cost+of+a+apache+helicopterPDF link annotation
    • 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_off0000e4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B1 16896 bytes
SHA-256: e6aeeebaf1e8264791f38bbc9bdeaa78361ae69e13ec467177b1cadae0eda49b
font_01_sfnt_off0001106e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12885 10504 bytes
SHA-256: 9576bf4413251915d3a2a6a489ce861c9e5c9080e56844682f3bbc9c34d1c9a1

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