Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c2e4bf715350ae…

MALICIOUS

PDF

98.4 KB Created: 2021-09-10 07:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c0fffa39f36bfe3d4ecd7c4d374f1ea4 SHA-1: af22a5ac42f52b00931ecf909c6a5b6cf931397a SHA-256: 73c2e4bf715350aee72cb8f65d93ea658c73be9ef133f734d9e4a187b30f2ed2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via these links. The embedded JavaScript may be used to further obfuscate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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 http://ailizia.com/userfiles/gesezanejigavepopuzi.pdf In PDF document text
    • http://constantcontinuity.com/membership/data/files/45462105349.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/p1a1omlv4onbfb3g8fk4c3s0qo/tukororipebudesu.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/73741586926.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132676b73ea2---71328283798.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/loginufuferadamifadij.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/kukakutowuzomun.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/vibepawara.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613843110aac2---13757476995.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/46063571357.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/jowuma.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/taxanijixidijan.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/99762109178.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/fagizet.pdfIn PDF document text
    • http://quetthe.com/upload/files/waroxobabitopegagapixodum.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/xetovobumizavineruk.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/4724492.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/zedibag.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/41309219316.pdfIn PDF document text
    • http://art-ball.net/files/file/52627935284.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/85658657702.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/45574971265.pdfIn PDF document text
    • https://norservis.com/files/files/xarugufidupes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+save+app+in+sd+cardPDF 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_off00011894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11894 19720 bytes
SHA-256: bffe06e53d56ea735294fc1752214fd987d6762b5c248e01d805ea3d1fd585f5
font_01_sfnt_off00014b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B81 10604 bytes
SHA-256: 6bfa62850f1b8b27048d33141bd0b3da7c625990e57b1f309bc3734de616e413
font_02_sfnt_off000163e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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