Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4999df18e1d27eb…

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 15:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5e2c339da58b0129915136d7ceca5d86 SHA-1: b6ff2056611dfbe4b4a8cb2f2125f5db0270f44f SHA-256: c4999df18e1d27eb15e615c3590457d24777b17e428caa0b01608c3e9ddcd0f1
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as containing a link farm hosted on compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs likely lead to malicious content or phishing pages, aiming to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16124609137538---sadagapunusakikuridiresup.pdf In PDF document text
    • https://cambodiadriverservice.com/userfiles/file/sakotuveda.pdfIn PDF document text
    • http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/56971365197.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/fujopukowekevamofagiku.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/9d74893b6b93015b9dc0ff00c607726c/dibodoxukowenavemejotug.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3ccf66333---bufewo.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa86f181a4e---tetapa.pdfIn PDF document text
    • https://aspirans.com/files/file/kisuz.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/dutufuzewasorozofa.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/16318482529.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c696dcc5dc3---memivakixisoso.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/fudafumexerel.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/vowifazozigedigirimubu.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160780d52014eb---dapujizujurolupar.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e48ff6a5d0---junavim.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/9453466fa56310a5aeafd81490f6c1bd/pinijiximupedopabo.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609fecefcd8e9---vovawomogaralodexab.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960a7e577eb---74270498582.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/maniwuzogukebekopeseruwib.pdfIn PDF document text
    • http://glassco.ca/clients/9/99/99aa1728c1dafa3cf8773a75727b87c9/File/gudomide.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/puzedixuxen.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/40221370596.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/323qq0lbv1eovjra0vh7ptcthk/kinesakekozajude.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/b0a752e970c8e3abf173a5946a08eea3/23166310192.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612a5c549e77d---vilalawukusarot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ascending+triangle+pattern+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_off0000e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22C 10656 bytes
SHA-256: ed11bcde722c4692d773812fd67cc439c287355a715780455213e24f991639cd
font_01_sfnt_off0000fa84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11296 17708 bytes
SHA-256: 22dd5135307276ffdeea1a8d0587057bc733cd75560f3416455e759b2824f032