Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a3f8dd0ed6e96c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 08:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d4f7c4d572fd08e25e12b8e57bacc9df SHA-1: 444e79fc36f2d66acb95fa32647e8d796cdb2634 SHA-256: b7a3f8dd0ed6e96c8147f6383857c645f0afaff66cb9f690194f06487489c677
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sure2trips.com/bot/ckfinder/uf/files/wapitekosuvujiranizi.pdf In PDF document text
    • https://lrsinc.co/userfiles/file/65774294929.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/35416223941.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/46941931599.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/88805734058.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210906044357.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/29970440018.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/vefubugudaliwuz.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/wufugiz.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/tmbhl2r5gqht0neebvv4h33d70/93496377769.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/vobiwujomarixemorede.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/zabajuvariguwelefivoseta.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/nojagulazeminomisovikobax.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/26261808199.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/libobogamipuf.pdfIn PDF document text
    • http://creationart.hu/files/file/51549281120.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/88179820842.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c5107f6e4---73706828602.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/xoxitugamoselitujofo.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/jizudexuxabumuv.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e01b6d6ec---39207524256.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/batumowuvelubed.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/dinatekib.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/92503827494.pdfIn PDF document text
    • http://sns.hu/_user/file/57978420512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=physical+science+notes+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_off0000d838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD838 18344 bytes
SHA-256: 91c328e92006077a220ab678952aa8279866e7634c556dbe1d7b6980bd77c080
font_01_sfnt_off00010847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10847 10732 bytes
SHA-256: 531c289d1ec7eba06b8f9f125b1f453767b8955d0fc585c896977a8a8e48862b
font_02_sfnt_off000120e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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