Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b144736f68079a…

MALICIOUS

PDF

78.5 KB Created: 2021-09-14 00:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4efa36f7dfca6e971b8b7abfb0250262 SHA-1: b0e1fc014dc3541980b3f421dd235f6e7ea9e41f SHA-256: e1b144736f68079a8b0106c2b56193fd8a4e0ae18fc8318b6e4c944c30bb76be
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and multiple links, some pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious sites for credential harvesting or to download further payloads. The heuristics indicate it's designed to harvest one-time codes or MFA confirmations, consistent with business email compromise tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://prospekt-rostov.ru/ckfinder/userfiles/files/kuleg.pdf In PDF document text
    • http://yaqeen-eg.com/userfiles/file/21134956296.pdfIn PDF document text
    • https://heureka-cz.eu/files/zixewu.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/74389097402.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/73734641184.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/datomomunonejamilokosu.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/beperapolotoji.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/32892057014.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dad1bf100---36293229040.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/tajomajezuwifig.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/68386357092.pdfIn PDF document text
    • https://mollis.rs/files/673429928.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/20260840907.pdfIn PDF document text
    • https://costarica4d.com/contents/files/77743091475.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/fekixizuwegunebuwen.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137f354d5328---lilivebutal.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4569d6d4e---12434633410.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/46146677581.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161378a0d50ea7---dupis.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/zowofodifafot.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/33178145050.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/58959592499.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/98586409432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=recover+email+password+from+iphonePDF 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_off0000d052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE864 16380 bytes
SHA-256: 2dae1b2fc13bd97bbe9bebf3469f1f10f15644a399fb659eb4c448cac6b8651b
font_02_sfnt_off000112ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CE 10984 bytes
SHA-256: 60892c77b2b1792db92ca9da0ffb25026e55c1499bbafe1d1cdb986b9677d53a

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