Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7710d967dd8b78b…

MALICIOUS

PDF

82.1 KB Created: 2021-06-26 10:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7910c6e6e60b5aee6b0b4b8a3b2c5144 SHA-1: a848cceffcee0d8eca7827e5480585111e8487f4 SHA-256: c7710d967dd8b78bf9d10fe71ce02a7149c0204180f8ea0b718ee762c77cda99
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites or disposable hosting. These elements suggest the PDF is designed to redirect users to malicious websites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=use+of+unsupervised+learning
    • http://zovsh.com/Uploadfiles/files/19351462420.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/c9a080654c4989146803065fb8ec76b8/vamidetisad.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aeac97b0694---94027866786.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/e1697d0636ce488065f62d4dfe318cf1/fovedixuferonomotomarikiv.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/1528462f2b0d33c567085e4fcc923f80/kikatilujo.pdf
    • http://inter-travel.hu/_user/file/maxuzifijusop.pdf
    • http://kingsauto-bar.com/js/upload/files/44231682791.pdf
    • http://nebovsem.ru/app/webroot/files/files/fetezujudotijig.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8fae70198---danizeleleti.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d8f183102---juxogal.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/87096d4e02233b245c7cc4c658c38c42/60538590726.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9627387344---40258240114.pdf
    • http://feach.ie/images/uploads/file/66760984638.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb29af179b---16246454493.pdf
    • http://chinoboxingclub.com/clients/36032/File/rugamorojoj.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/c5cf6350d8d046f808c16c084f22e3d6/rewewujazawitos.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2f615af3b---podabuwawo.pdf
    • http://csc0351.com/userfiles/file/20210621193754_7t724y.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/gfpd4vcskj4jgnu0fggvei7887/45757147190.pdf
    • http://arniestribu.com/campannas/file/borusekasulafa.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081389a9c232---vevaduv.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df7b.bin
81170cc82a064adda31aa207f3d1913a0b4f333d6cdd7e01abc97970cab328be
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7B 16176 bytes
font_01_sfnt_off00010958.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10958 16792 bytes
font_02_sfnt_off0001216f.bin
696f063b5cce935c3bdd0e4f5fec439700dd3d8f7420f99e46fa794842f2772e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1216F 10748 bytes