Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb8c228c044b98a…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 17:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cdd86fd2eb7b5f663881566551c1c9d0 SHA-1: 38aa960429d514d7a148b0eacc1a228b732a9d67 SHA-256: 2fb8c228c044b98ad606f1ef4633136cdee49d5b36ca177b5e75c6e051f27b9e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple 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. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://riggi.ru/userfiles/file/8392145679.pdf In PDF document text
    • http://musikpark-live.de/userfiles/file/zexibikowoza.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/jugumuromanesoxe.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/waputaw.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/fatun.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/gesotigevak.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/nekobi.pdfIn PDF document text
    • https://n-tlg.com/files/file/fasuneza.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/88497636977.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/numurewodupamazu.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/71f865596c6b42b9fc0f8b8899368338/83820671380.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613c40519aea2---pujil.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109031954553993.pdfIn PDF document text
    • https://tele-video.ru/upload/files/22638854935.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/morukigapivumigavil.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/37564468110.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/dezema.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/25258609128.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/31302077993.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/siviki.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/34057603334.pdfIn PDF document text
    • https://12shio3.com/contents/files/lowajedonoberaz.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210912_152245.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0f6ed3eabb7372a3b157e1be35f0d985/wujudowemozuzipevol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=minecraft+papers+pleasePDF 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_off0000d1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CD 10348 bytes
SHA-256: e757bf33d5d4d9058cd5370b22e0aabf32ea704e8e9d441dfc8de7e64a813f7f
font_02_sfnt_off00010142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10142 18560 bytes
SHA-256: b046713340316a1697c6598cc9d47adce33165f20fd632935f694904a281bed8

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