Malicious PDF — malware analysis report

Static analysis result for SHA-256 547f27f83a8303c5…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 09:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ab2a7d92181e055b649f46abd2e6549d SHA-1: 6a08635d9dd16755c8eb057f0dff66168e62cd24 SHA-256: 547f27f83a8303c51457a656fbe4443b3e64622c060b62c468826f1dfdee6e4d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that redirect to various websites, many of which are associated with link farms and potentially compromised hosting. The presence of urgency and payment lures, combined with a high ML classifier score and ClamAV detection, strongly indicates a malicious intent to trick users into downloading malicious content. The sample's structure and embedded links suggest it is part of a phishing campaign, likely using spearphishing attachments as the initial vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://huntic.ru/uplcv?utm_term=mi+pay+apk+download PDF link annotation
    • http://dansungsala.com/uploads/files/84126823955.pdfIn PDF document text
    • https://remini.hu/userfiles/file/77021697521.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613540a505b64---47625896938.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/mevubaxagosunediveb.pdfIn PDF document text
    • http://bankerz.in/qpic/files/83618192804.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/linikikomibolejeresi.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/kuxaluvowusiguzupaza.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6370e5623---90165845538.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/rudagesosekokupepem.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/sulupikofejalo.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/80491999583.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210914_4254F6937A273D5A.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/sifixivalelogatubofexi.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/99018536571.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/14348200903.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/wilibesorijofasegifalu.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/luditalepexafexofu.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140400801d23---ragivalolowovizalo.pdfIn PDF document text
    • https://limsurdua.com/contents/files/xufuwapubusinarumaj.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/92627014481.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/wubugolozopopo.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/19162870095.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_off0000d32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32C 19004 bytes
SHA-256: 78bd16eeed3494e9a3ae9c8bc5149c9d5486c17c6923c48660cf324fb433a8e3
font_01_sfnt_off00010599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10599 10172 bytes
SHA-256: 1b8f96625a71106c02283aeaee8208adba33f301adce009d5a77eb39ce926ce2
font_02_sfnt_off00011c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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