Malicious PDF — malware analysis report

Static analysis result for SHA-256 1793b7c1f2442568…

MALICIOUS

PDF

83.7 KB Created: 2021-09-04 03:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 491e5e6e5d289e39d05f2d4986b80794 SHA-1: 2758715a42f25c6d267e1fd06ae08696c3115544 SHA-256: 1793b7c1f24425683bbbe26a34cbfb47fb00bb4f6321f13bf28f484ce2b6173f
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or trojan delivery mechanism. It functions as a link farm, with numerous URLs pointing to compromised websites, likely intended to lure users into downloading further malicious payloads or visiting phishing sites. The presence of multiple external URIs and a link farm heuristic strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://chingyi.tw/userfiles/files/foxexupalejotolemi.pdf In PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/2bacefd8fccedcd1e6712a85026ee806/mowaxiwubagurilobavopuxas.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/2649121122.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608790504847d---69453829468.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ccppqjvkc2cmh3llf23gbqe8ih/dizupisekagegosisowimi.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/66e6ae8d084bca71d1e392e84cb88008/sumimemojodaporiputejagep.pdfIn PDF document text
    • https://projetovm.com/uploads/files/jidebikigoxibiwu.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/72404009904.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/dutijukinirosedug.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/83977736332.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/29902957263.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/33949518977.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/fagesovipe.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/velebeses.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/4g19ao67vk0t1phuboq41meu65/dapakefawulojewav.pdfIn PDF document text
    • http://naviway.su/upload/files/63556267154.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7a1b82783---safutabomajopimepebus.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/92115264857.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/blept5ss36filnsurt3gl9nnq3/mogejewezidonisifiwiguw.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609088198280c---karuwewafakorok.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611e15b95eb07---9000210272.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160971f58aea46---83976097855.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/bebiponutuxuvu.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073b89e3fabd---movazibiposamulaw.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/41925588225.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/39f39fc3a37a7876372cc98ecdd52162/83957301116.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210718_050530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=microsoft+excel+2016+level+2+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_off0000df1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 18484 bytes
SHA-256: d64ff10da4ab520cfd590ab7440c38b2dd916f9f406cc98fb4a86dc0ae5cb290
font_01_sfnt_off00010ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBE 10972 bytes
SHA-256: 41111c0bbcf0bb52e70f936445536a0b7f3af905d246a9b55cc381cdb96f459f
font_02_sfnt_off00012875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12875 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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