Malicious PDF — malware analysis report

Static analysis result for SHA-256 542f340fe5277b24…

MALICIOUS

PDF

88.4 KB Created: 2021-09-16 10:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c17111c53e2b9efb0e27d8d3eacf24d0 SHA-1: b692cc20092a22e363ac8da0e260103efd85849a SHA-256: 542f340fe5277b246ab8568e204fbfe232f3e2111055da0bcf9b88e4494b7fbb
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a phishing or credential harvesting attempt. The heuristics indicate it's a lure for MFA or one-time codes, and also a callback phishing lure, suggesting it aims to steal user credentials or trick them into revealing sensitive information. The numerous embedded URLs, many pointing to compromised or disposable hosting, further support its role as a phishing distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://yunglin.com/uploadpic/files/57391201107.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c37e4cd329---24001272199.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/gamonisilelupowu.pdfIn PDF document text
    • http://electric-kernbichler.at/ritapefujiwimasupi.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/90421734668.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/83470251896.pdfIn PDF document text
    • http://hidramaco.com/files/files/37673837912.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/witokajur.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/928c6064a0e210cdc946a3c25fe7f312/9287513665.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/wamizaperadofimuguwida.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/milalomobukokovat.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140d41b6f3d6---94447851984.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/32249984149.pdfIn PDF document text
    • http://honghuibio.com/d/files/xakukedorus.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161421630ebc73---bavevexatoju.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091607524245.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16140baae856c4---34591438475.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/40424148180.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/26507864777.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109151432248473.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/tobivakezoliza.pdfIn PDF document text
    • https://producto.works/userfiles/file/foginajoledur.pdfIn PDF document text
    • http://logicamail.it/draft/media/bonixodokagetidope.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403a7043def---todusopirupitebezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+do+i+setup+my+hotmail+account+on+my+android+phonePDF 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_off0000ee7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 11072 bytes
SHA-256: e4a962272a173c0ac9f186fa0f3e3a44d6dc85f3212ab658c3e283fad833ee8a
font_01_sfnt_off0001081b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081B 19756 bytes
SHA-256: 531fa800cd9dfb6593ac9d43c97b175c5004d4f18014e1225c68394543188d13
font_02_sfnt_off00013afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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