Malicious PDF — malware analysis report

Static analysis result for SHA-256 be637f22c4736f22…

MALICIOUS

PDF

77.1 KB Created: 2021-09-08 20:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1ea9d0173499ff53d275a8795d521412 SHA-1: 075bd3b661f6fd42ee2c0f88ab121fe7a72f9e32 SHA-256: be637f22c4736f227c5ca264e319a612c2181b0bb768d688145103e4f76e7edd
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. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely lead to phishing pages or further malware downloads, making the document a tool for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://hightopeducation.com/cms_uploaded/file/18126598974.pdf In PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137349b4a13b---94391580571.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161312740ed78a---66951405905.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/80444112650.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/55432336782.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/43988866250.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/47570306927.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161365528926f3---54082195198.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/davad.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/kuvek.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/4030573625.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/54766823151.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/xemoveno.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f212cd1da---71910863810.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090223460412.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/51279546492.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/36904027679.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090521460573499.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/27066837847.pdfIn PDF document text
    • http://www.agot.pl/upload/file/bivenokepofikilokes.pdfIn PDF document text
    • https://pr-dienst.ch/file/12498551674.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137d5a00d14d---xadevovogufer.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/57490179753.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16130ec0c79318---tegepobimatetitod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=el+carlismo+dos+siglos+de+contrarrevoluci%C3%B3n+en+espa%C3%B1a+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_off0000c17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD992 11456 bytes
SHA-256: bbdd3024063064ad1b7f1a2058e1146f7a4d1cc412820805fd6396d82839dc90
font_02_sfnt_off0000f3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EE 18560 bytes
SHA-256: 04d9117927dcec978daef60f93f84e5f0f1cc7b1ee2891e702157eea694194ff

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