Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1542fa20c6611a…

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 00:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0c917796ea52813f7e59e67af3dd67db SHA-1: 1fc4168ab3a62ace43b7c44e109b1e25ca6a29c3 SHA-256: 5e1542fa20c6611ababfe6413278befee29de834bc776a2a751962ff6dd19d0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bevelec.com/bevelec/dossierMois/file/juxutenevofifomikaxavaxu.pdf In PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/14140501278.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/49013083936.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/12916555456.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/19356639473.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/0cdc9cd432bef5255311d4006805e951/robetanejola.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7021b58141---954468753.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/u529v99iiriauqaaisfoaoai83/boxudulukubi.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/536c0996bde18a5d21c9cc1894f79ff6/zuxozunafebalejogav.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/82325034723.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/33924990222.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d109529393505fe80bd11c8c3c9898e1/gagipegegoleruruvomoxa.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/33438983618.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/22980310232.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/89599789098.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/50299071033.pdfIn PDF document text
    • http://kelvista.lt/images/files/joguwisigijekak.pdfIn PDF document text
    • https://patc.fr/imagesfile/zagox.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/62890357441.pdfIn PDF document text
    • http://www.polni.si/Images/files/vobagiz.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/46054703906.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/69233973608.pdfIn PDF document text
    • https://dalba.net/other_files/File/72320327580.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/garasopobizopaverupipa.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021062302503973499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ceptam+9+notification+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_off0000d003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD003 18572 bytes
SHA-256: 2be4cd12e677bd9159161a24d6786636866dd0ace3ca6ac2cb54a857724391c2
font_01_sfnt_off00010004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10004 10664 bytes
SHA-256: bd7a0e3ed447cc74d8b65456fc251bcc564c0bfb778e201a08e532c9715d70ef
font_02_sfnt_off00011878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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