Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d930c31ca5ff9f2…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 06:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 50276b0240a15a78956ba21b6ad290df SHA-1: c4634403daef19ae2eb34f5a703e8878a157e30d SHA-256: 4d930c31ca5ff9f20c13c8320026af873bd28e681babad095b4cb183b91a1b85
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of a 'SE_MFA_LURE' heuristic indicates it's designed to harvest multi-factor authentication codes or credentials. Numerous embedded URLs, including those pointing to compromised CMS uploads and link farms, suggest a phishing campaign aiming to redirect users to malicious sites. No scripts were extracted, but the PDF structure and heuristics strongly indicate a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=i+forgot+my+phone+lock+code PDF link annotation
    • http://ngoinvest.com/uploads/ckfinder/files/juvut.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/titujori.pdfIn PDF document text
    • https://bczenekar.hu/files/file/1154470634.pdfIn PDF document text
    • https://penal-garazh.ru/files/27897443108.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/11bfd0baed38c5b2419a0eff238878bf/15509837507.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/58436163007.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/25677088055.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422924c99a0---gosoraxanejakaroxebujabu.pdfIn PDF document text
    • http://special-pharma.com/upload/files/23209140124.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93061962467.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/c155f6636c80cdfa4047271cee27ebfb/jutejozetup.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/79535132145.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/bavimaz.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/57206600951.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/88085613413.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/favusawoge.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/381990289.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/vaxikorokukevaj.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/60111873374.pdfIn PDF document text
    • https://notarbrazda.cz/userfiles/file/In PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/pilisas.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/kodosikikosejob.pdfIn PDF document text
    • http://short-story.ru/upload/file/84956121040.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/gejuluwusodadipepu.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/1d51294f719d2c640ba73f59d463f52b/rewudo.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_off0000dbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC8 17312 bytes
SHA-256: c1759a91ed5effee7a062d50d112638dcd61e76e80d4d1442a2abf3c0ad7de83
font_01_sfnt_off0001087e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087E 10804 bytes
SHA-256: fcd991fe867c57a911b6894be568cf5f7db40a1b7e941b64e0f6e36512249757
font_02_sfnt_off0001210b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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