Malicious PDF — malware analysis report

Static analysis result for SHA-256 954b80cfe445c40a…

MALICIOUS

PDF

106.4 KB Created: 2021-06-26 15:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3df7fe42cec41be6141a3c22434244f4 SHA-1: fc2adb3c6e7e7f8eb9e7f1fbda8f8193479b4cab SHA-256: 954b80cfe445c40ae8f5d19f70e096efe1466282be0eeccd81e20fdf874b2038
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a malicious link farm, specifically designed to redirect users to compromised WordPress upload storage. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests a business email compromise tactic, aiming to trick recipients into sending payments to fraudulent accounts. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • 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 https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1574e761f---riledafilubomopuxuliwo.pdf In PDF document text
    • https://aristi-trap.com/upload/users/files/68127269371.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6b7c8debc---sozuwaxemeletip.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/115c0ce4f1b674241ec8d31c15254acf/41935473017.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/fofiwupojebemazazizuzos.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077cd9d9e6c9---xuruta.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9757496d9---42716335652.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/rghd4otoj704lo59g6evfeelrl/24577490278.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/9328814465.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/a3enitpt13klonfk1esb9ngb33/nizadusularuwi.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210508193520_1057934820.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608784aebc248---dalifiwisozewujipa.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/4a8c13a0c0a3d25132b65e51fc6e2fc2/wifemuriwadepibapemeno.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a727aacad---vafidewup.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/25999667783.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a98ce46f09e---nerekevefulodisi.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609612225f378---30701771933.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/gudigadidapijedu.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/25676412590.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/zimiregopozelesavazezi.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed308d4504---36673378598.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f64a7365---52006230938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=chapter+14+of+the+giverPDF 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_off00013da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA8 10548 bytes
SHA-256: 2fc91616002eacad5904ef7e271339ec9f669ef5a64f2cfb842ec8e70e29c74b
font_01_sfnt_off000155fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155FC 17132 bytes
SHA-256: a9af0d953223130c95679def0bd37fca48408d06a4f93727ba6f891fcd082b1a
font_02_sfnt_off000182f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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