Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd55c6e36abca30a…

MALICIOUS

PDF

89.9 KB Created: 2021-07-12 22:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ec62379280b5cddffe97d5c46db39b7f SHA-1: a5c4a4e418a3df381a270d1cac8e05f8c79604ad SHA-256: fd55c6e36abca30a882cbfeb72eba7562de853179db4e928f13eb8b10d30868a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristic analysis indicates it contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. The embedded URLs, such as http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094c8716100a---nosidizopikejolefa.pdf, are likely used to host malicious content or redirect users to phishing pages. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609744c0c3628---timopizaxisu.pdf In PDF document text
    • https://iqmuseum.mn/uploads/files/vojuvuterilirabu.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/96516487596.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094c8716100a---nosidizopikejolefa.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bcc2b7f7e---lepuxavuxesosoj.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/46415109341.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f75a60b37059ec74d657ae7f0ca0687b/pesumobaniduka.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609480e1a58fc---54366938002.pdfIn PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/bigozekodina.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16094df1c1362b---kefikafuxa.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608718501fd7e---46357755116.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8424aa3dd0---delepoxotoxi.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/i3n0smjh967b47ivb2cdt2g2vv/21451824036.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0148683f28---71909727046.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/ba8e3s5js4ljqaooh5qe9adb04/8807193283.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021621644432582.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/66983045534.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/53da8a1ec293720d04daa4fa5de7ac07/lunexosubuxelaluxapisol.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2dd5b6e6a---giwumudiz.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/0b12d65337f9e1339d5917f74daa6a06/niguliso.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f689cc9a01---bofapazof.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/91479080532.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf858c86a2d---kewaxu.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/nepatozapubemofidap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=paleo+diet+meal+plan+for+weight+loss+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_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 17220 bytes
SHA-256: adac6ea3d275407d1b183e50fb91df5c7f0fbfb74ea59fd507d5e87b0d6a8539
font_01_sfnt_off0001272c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272C 11032 bytes
SHA-256: ab41d73a36d05712cf60e972840c5bf2a7fb42c21276a0b0105845cdbfe5c8be
font_02_sfnt_off00014072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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