Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42ade2b72ed05dc…

MALICIOUS

PDF

76.9 KB Created: 2021-09-10 12:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac7c056c73faab3895f3c24360694602 SHA-1: 891a12614ca4969aec956f02e0711e712220ca7a SHA-256: f42ade2b72ed05dcde4f7d344f2b0a701c77ae630f7f21ac50da43c76b0a4a26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://gianniarnaudo.com/userfiles/files/96646481551.pdf In PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396b3a8690c---nunuvijomisukilerejo.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/palubowuvi.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/5bcbe8d2867f0d14eeb456cae51c4fb0/71937254465.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/jazexerufaza.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/24961479874.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/setobuvufu.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/kokebesuwojabed.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/fazepexasi.pdfIn PDF document text
    • https://ratodua.com/contents/files/14414459690.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/kavekonamagura.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/xejusabixunudilepis.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/b0232800df1a375e6adbc3a9d507b7bb/7494320319.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/10708071740.pdfIn PDF document text
    • https://fuoriscena.eu/file/misokasega.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/86382928911.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/pizavawuwadupido.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/68725808298.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613656559081d---liwogumesijevujuwor.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/bozolasiwetegozeju.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/nesiji.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/gazagi.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/79018074633.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/joledap.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/bapimilefitodiralu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ping+mobile+lite+indiaPDF 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_off0000c337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB49 19516 bytes
SHA-256: d1fbb148a60c3fe58efdfb345cf32eb6eade3e09352b8c79c743ffc80b17e1ad
font_02_sfnt_off00010ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA5 10464 bytes
SHA-256: 6f462a12821c17f0af8e98a9339cff28f1bbfb5e31d69b2d92d69006dcdc7d22

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