Malicious PDF — malware analysis report

Static analysis result for SHA-256 c06f5ccbe1e75930…

MALICIOUS

PDF

74.1 KB Created: 2021-08-28 02:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e3cf839ab2bb5a27774486b6f32dba0a SHA-1: 598726b0c61380ebb3a4f82ce4447a0d2539a7d6 SHA-256: c06f5ccbe1e759303e9854507dcb579daaae622b74414fdc961381a808789d82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of multiple compromised or suspicious domains reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://aliceinformaticasrl.com/user/pages/kemonodipimajuzud.pdf In PDF document text
    • http://atmaircenter.com/lb/userfiles/files/67929288527.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/kijupizegurobun.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/vobepokeporuturajina.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607a793bb8869---21103745905.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/1e692313cb4b09bfe0023a6c32990e95/14740722247.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/tuzazitebimosumewivalekex.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/janewux.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/82488428222.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/dufopasodudas.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/4e5q9lp9aut7pv7fi0bime52o5/dupirefugone.pdfIn PDF document text
    • https://blokhol.com/upload/files/ruzinenozowizulagorodaxe.pdfIn PDF document text
    • https://hssanesteban.cl/files/barokawebufujukam.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/1179365d5988e1e22534a88dd3b3b7d9/pamexedosina.pdfIn PDF document text
    • http://congluc.com/upload/files/linugozi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dfad7bfca---rofupedinovuzexa.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/27126743973.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/pejevakikijufu.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/78cb9570e6c7262f131849000ed4b37f/dulanigo.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/818a3aaa92f7b7005eb5ae2a21833d6a/61016214404.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/34011974962.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/pabovakepigo.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/84deb61c4dab5135be3d94be44952b33/vubibimefixijuziruxenemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=transcribe+voicemail+iphonePDF 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_off0000bf39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF39 16924 bytes
SHA-256: 53617a30a57827b4d4d567eca1dd3f7671b8882b90b0e1b0b14d61c56042f20b
font_01_sfnt_off0000eab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB4 10708 bytes
SHA-256: 9fd7244f5e2b45030475e6994e1e8b39feb854891a7b132b67d32dffa808d9e6
font_02_sfnt_off000102dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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