Malicious PDF — malware analysis report

Static analysis result for SHA-256 1efc0ca4c1743ca7…

MALICIOUS

PDF

77.6 KB Created: 2021-09-11 23:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31a43b89fb8dc84ba7b9bd27998d8436 SHA-1: 2857b45fc006f06ffca8a4c55e2179ee30557f2c SHA-256: 1efc0ca4c1743ca7e07195656365398eb57a93d594c7c7784d6cbc38ca704aa6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a lure for phishing or to download further payloads. The primary attack pattern involves directing users to these external sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://philabc.ru/uplcv?utm_term=when+is+season+5+coming+out+in+my+hero+academia PDF link annotation
    • https://jagamimpi.net/contents/files/bususaxibejokaxo.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/88998270581.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613940d26b834---wadabos.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/nuxifutunidifod.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6ef6db96b---23653459001.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/gumiwu.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/2351f21e8b66806d1bc864ea0c3facda/nivaserezezinikulak.pdfIn PDF document text
    • http://sns.hu/_user/file/bowijunejoguboradas.pdfIn PDF document text
    • http://szm.hu/userfiles/file/refedujunewatejalozepi.pdfIn PDF document text
    • https://thepainter.asia/upload/files/ponukeditixujutupajev.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/rogonade.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/denetepexigijisesejifupe.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/wazugezezape.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/6426863669.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/11211510210.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/budufinexagakinu.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/9c287d3fb6716f8656c46d9e1fe27847/52253703041.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/daxigixed.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/57366076765.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/27213432987.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/6078424661.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/18612364278.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/4gro3309j0ncnatc4sfs1oav70/90848793208.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/80005524807.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/85263110989.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/pefozaponamuzefudekorete.pdfIn PDF document text
    • 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_off0000c9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FB 17196 bytes
SHA-256: 3085f1ab0cdd8c564aece4273ff3e21bfc17c103bf9cbf0fe3679b0a6f2f612d
font_01_sfnt_off0000f65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E71 11112 bytes
SHA-256: e18509f5c6592f5b1eb7caa3a830c524982cb0f7c573cb00498220a89dc78a3b

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