Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f6dac8eef30ca1…

MALICIOUS

PDF

87.6 KB Created: 2021-09-11 05:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 50625aa780f74465fca5a5feaf8fa6f1 SHA-1: bc32f150236f73c3e724f422144ec65e123b2127 SHA-256: 39f6dac8eef30ca1b867ce91c4ff2b24bab6f95ee98c78e3ce8f4aaf195aae2e
256 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML models and ClamAV, indicating a phishing or credential harvesting attempt. The heuristics suggest it acts as a lure for MFA codes or one-time passwords, and also contains a password-protected archive handoff, common tactics to bypass security filters. The document body is heavily obfuscated, but the presence of numerous embedded URLs pointing to potentially compromised or disposable hosting services reinforces the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://stef-nancy.fr/upload/document/jaroxenagogar.pdf In PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/pokovafavorawu.pdfIn PDF document text
    • https://kvzriu.org/images/file/gizot.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/rorisivetiwomarixid.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/42616096522.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/zowufosodu.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/daxarijedotuvaguve.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/3101386823.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/21834607568.pdfIn PDF document text
    • http://palami.by/images/file/ginuvureg.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/kogugilagul.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/danivujunozemegujuganefi.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/14611298362.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/xuborupokekof.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/sufugekenibero.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/21498822690.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16130585106d50---51797997597.pdfIn PDF document text
    • https://termoformat.md/img/files/soranajatogeninasij.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/12693834316.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/vutelavofixewewu.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a1071d5a6a2d7f45eee2c62b7cdf6a1e/pixenogosi.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bea3fe94f3---wutuwopikoweseno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=android+11+password+managerPDF 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_off0000f253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 10712 bytes
SHA-256: 0c11bfdf48f5d1efbcd76f5475e6ab1fb05dd391733646530e6b088fb93340a0
font_01_sfnt_off00010ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DB 17988 bytes
SHA-256: 3b2efe61c4245cd7d32a550308e275b93012aae6cbeeec7c3d67dfe717dfe00c

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