Malicious PDF — malware analysis report

Static analysis result for SHA-256 0424664ff77f90fb…

MALICIOUS

PDF

100.3 KB Created: 2021-09-05 11:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f236de472a0ecae7b0efa52a090ea1d3 SHA-1: a16154ca09f2a79e06a75d189f18bf018fc6d181 SHA-256: 0424664ff77f90fb56a964e2813bcd36d9fa1aa6a3c0251380b8b24b5ec0a694
164 Risk Score

Malware Insights

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

This PDF sample was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to various URLs, some hosted on compromised CMS uploads, suggesting it's used to distribute further malicious content or phish for credentials. The primary attack pattern involves luring the user through a malicious attachment, likely via spearphishing, to interact with the embedded JavaScript and external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://xulynuocphangiathinh.vn/images/pic/file/69838231330.pdf In PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/357248881.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e50139f2e0---wuvufejesatuxadotefojo.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/90880858684.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/69f7aaf607ed063f8a2502630ba8c712/77791007442.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/41814969148.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/27876849766.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/46586808642.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/e9b0247d0242bee85387dacd16b8e942/kuwopekukoboponom.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b77dc2395d---33966372875.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/53581606420.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/liwuropironozowevitezumo.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/vgjj2ufjrjtv2ehlu733qjm1h5/xaroledi.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609447e4653f1---mapekijixatigeka.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45fcb8885---14511121731.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/siwamilurupuvufomigiwuxas.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb9054999f---16084618075.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/fatulateneniv.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/dibafilebirigivute.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/kalefowanu.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/gojugiwipexud.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/b1166c34f301fec924d6a93eeba66edb/wavuruneboriwiselikofoxi.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/cadde1ab5f04ab6a3e26e7657482e33c/17364494573.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f172d380ca---patozatuxaxiwaf.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607944a3021b4---35881651839.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/84165442856.pdfIn PDF document text
    • http://sam-global.ch/files/file/dufes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=transposition+didactique+chevallard+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_off00011f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F00 10992 bytes
SHA-256: e1e5e5ea8fa349e14681a37a28a9ea3bea178139af0e9183e60073efa091312b
font_01_sfnt_off00013841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13841 19372 bytes
SHA-256: 632c5bb3a89df37a806f532c1db42f305e56a64e87fa1972a16f6e0e1d366e4d
font_02_sfnt_off00016aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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