Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f82bcb36159c3e…

MALICIOUS

PDF

86.0 KB Created: 2021-08-25 14:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: baec43ec0092316768c421411bb5e6c6 SHA-1: 0ae781935f5c25ef8046297bb38f0f5b3560577a SHA-256: c1f82bcb36159c3e31b0027ebf11fc109a60fab209124fce4be3bd85dcdff1af
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised or disposable hosting domains, suggesting an intent to redirect users to malicious sites for phishing or malware delivery. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://tareeapartment.com/user_img/files/kujuvejomuruwopip.pdf In PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16116ed282692e---tigavituw.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/jafagip.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/79867816741.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/44312235929.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/51183454531.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/73e638252dda801ad0ab78933398a0a7/15251532434.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b40c94f416---69109826320.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105151224154312.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107251043267422.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e02211b91ac---74415295675.pdfIn PDF document text
    • https://fallsplat.se/file/tesotopefoxu.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/wedadokobuz.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/19456776811.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a395713f36b---kawajiroxitezunar.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/legufadumave.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160df2a646bd47---wosoju.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/16361533316.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/l958sbou7fe4ptuhih5hdckgp0/rizeberevusesopexe.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///xukinefubefogomine.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161063b10739a8---tedud.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46b7a16d37---mijasovajur.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160af31116c016---12967307299.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/4768bee6694a6fd49acffea981345c16/femiluz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=positive+affirmations+of+self+lovePDF 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_off0000ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10471 17036 bytes
SHA-256: 3781cd5e55ca19853b9dacf5403bc69f0b7808fef22125c540c30a70c89cb371
font_02_sfnt_off00013081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13081 10440 bytes
SHA-256: bc9cc51e1b98da3a33a02e697ab0c1356eaee56c36d603e5b19dda76918ad3c6