Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb67c2f95af76d1…

MALICIOUS

PDF

150.8 KB Created: 2021-07-31 12:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 89c428d7b11cc6b174ccbd228624105d SHA-1: b557fd078b3de6c84ccf874892060b932ddc30df SHA-256: dcb67c2f95af76d192e2c9781d3bd26c011a65a3c60c0b9090c0fad2ca3c7a0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and link farm heuristics, indicating its primary purpose is to redirect users to other sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://queure.ru/uplcv?utm_term=chiffre+en+lettre+arabe+en+ligne PDF link annotation
    • http://wonikqnc.com/upload/editor/file/1626713717.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/kekarakadivom.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/4774410949.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/4kmppcu753sukcr7b5hq2fa4ov/37104881487.pdfIn PDF document text
    • http://tfforming.ru/d/files/toduzefugonitokosujoleviw.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b3c8ebd09---80273137189.pdfIn PDF document text
    • https://bauarch.bg/files/bofomag.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/55557773859.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/ropoponaxosijizunugi.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/948d622f28ecc92c5ed69e821a4579a9/sugozipudigufib.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160864dee20932---lumarukuzem.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/6fc86faa9c604b710c3f4a5d71fb4bea/91583191042.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba824d3307a---dalikozepen.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd1f0ba171---29584831377.pdfIn PDF document text
    • http://kgmda.com/upload/files/94990689553.pdfIn PDF document text
    • https://webmenuplus.com/images/file/rigex.pdfIn PDF document text
    • http://fbhsclassof70.com/clients/f/f6/f6e65d48c6cf753e26882f86001d336b/File/pidefobusiwiwepo.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/fcd1405f03007a4e5a36a2b88c4066f9/livujofuviveleweju.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d4248c089---92707556063.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/f3786c1e7c828e43ee776bfc3b8f1c68/kakan.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104c8fe62b74---dubabokiwavutesolata.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/zuvixuvexiwarurilatovarij.pdfIn PDF document text
    • http://sushibelovo.ru/files/botizegeriwine.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/11914339124.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/binumifupadezoponuraw.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00020eb7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x20EB7 35684 bytes
SHA-256: 163b64fe54b4754a8c2a7a0eeb5df7d25460af1c939096f51ebed004811867af
font_00_sfnt_off00019d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D5C 10376 bytes
SHA-256: 2ec52e7738a33700f90b0f21580f8c1918ee84fdf1f5d416b9041c91cc3558b3
font_01_sfnt_off0001b4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ccd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCD7 27864 bytes
SHA-256: b2037c407b0b4f09ac053c992d3e4c482da8b9d430c1d4cf95f57380b632180f

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