Malicious PDF — malware analysis report

Static analysis result for SHA-256 3896341abc5a7de9…

MALICIOUS

PDF

78.9 KB Created: 2021-09-21 12:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ea9894a0a7fb435dcfe6491e5ade6e95 SHA-1: 01f8d78d89c83d23ba94658a6a9ee5fc92694e91 SHA-256: 3896341abc5a7de98d453b09a7c533fc09c38442b4b07b583a63acaa1fa44589
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a link farm pointing to multiple compromised and disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further malicious actions, such as exploiting PDF vulnerabilities or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://stiff.pl/ckfinder/userfiles/files/vibizugifowuja.pdf In PDF document text
    • https://undergroundtakeout.com/userfiles/file/3575866063.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/jotugibowopefojelego.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f78194d051---gulizopaloxegojusujod.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/55998071536.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/3993280006.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/57593537590.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/duzenemalulubimebave.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/56616642546.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/bf185462a57a70728d2810b69b85479f/jaxefakuwe.pdfIn PDF document text
    • https://limadelimon.com/images/file/dirijufitup.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/97541132772.pdfIn PDF document text
    • http://kustari.net/userfiles/file/52575064702.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/65489041547.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/fulasekefodig.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/lidilipi.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/0038d830ba52948fc2d81a5e81b57fc9/20998679888.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/vuluzexipotadinamu.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/winukisazo.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/gipub.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/dff377c0d009c5040fac95579f7b2187/xalaxisetejabog.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/21250429352.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/34173470827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=connect+android+phone+to+pc+screenPDF 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_off0000d180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD180 10596 bytes
SHA-256: 68a1bf5789a8ff88756a9d70cdc528dee1e5144d69a47b16d17ae345f7400f93
font_01_sfnt_off0000e9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BD 17144 bytes
SHA-256: 30c5f50d524b10f523030a3c658ad1df21297db651c09f662bfe6426bc21dd05

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