Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d0d65d3ca8a6eb…

MALICIOUS

PDF

88.5 KB Created: 2021-09-06 06:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9bf8a7fdd804759cf478601ae33680e4 SHA-1: 62d211a65b6d991436a6a90eb6f3b58a067eed87 SHA-256: a9d0d65d3ca8a6ebac1a21fe95b45faacab0a4a5dd9420a4a0e18fe4e1e55684
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely serves as a phishing or malware distribution vector. The heuristics reveal it contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the ultimate malicious destination. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://widepolymers.com/userfiles/file/39451583947.pdf In PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/69114070768.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb1f95d085---fukudububajumonupop.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/647830e98ab11725a1d621e80ac340f5/37558843156.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e477d478---vowifoviw.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc7ad527e3---dijarapojobomuz.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/64932099442.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/e85a54c18109ba055034fa50f9dccad3/fimiroxowivimiw.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/45655579737.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de1f04ca91---bigomosutod.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/gojujuzazo.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/sukavujarob.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/39611660396.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/dovipunedesimukuwovo.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2e8b94755---xukagasexepadufupuroxe.pdfIn PDF document text
    • http://chapelguild.com/images/usr/24819978472.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/xofefapolexonusizunesine.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/4937b8409a6081831b1552df49ef6e8b/65580318200.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/70275303780.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8aee3cd2e0---71602833786.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a9cf0da52---59811713259.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/vunevotegug.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/bizigodofod.pdfIn PDF document text
    • http://skomi.ru/img/files/file/mavisuzovutowenabipijura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=autoestima+baja+en+ni%C3%B1os+pdfPDF 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_off0000f07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07C 11072 bytes
SHA-256: cbfbad36e77196729ab78850e6339a96f35e9cdb4af1506fa2ca74a1cb82a4a3
font_01_sfnt_off000109d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D3 19024 bytes
SHA-256: 757d60f76ccb2934b3c2dc2228d9fcb6348aca8027b1823f9bb6c4dc354a3264
font_02_sfnt_off00013a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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