Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d4ffa7a4c3f262d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 04:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a807ffdfd44b8e02a9ec118629894055 SHA-1: f20e4dd32969e4af8b6e16f9bffd2ff865b07441 SHA-256: 0d4ffa7a4c3f262dc7b7128be5ed1efc30c262f63b2117cef98c086a721bc2ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised CMS platforms. The primary attack pattern observed is the use of a link farm to distribute malicious content or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://www.irrv.org/uploads/files/tojegosimusoxas.pdf In PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/d87941f366d80b0b8fc069319969d2d9/14873621936.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/89936108540.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/45df53db03d1ae1eecd0bf632da8c8a5/20008890284.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/43334692151.pdfIn PDF document text
    • https://sitarasign.ir/data/file/tizaletaza.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/lokosagupipizilabarixu.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607301956d9d9---watob.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/rajunajivoxosogesixapov.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e7a85f662---nekuvubugusakoxunagom.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160ac091879e83---bukenomuvanimozonuzomi.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/wekamawilinodufogipuv.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/e8440626975dcb52cf7fe19b5a063e17/wojupibosofexerujamamojuk.pdfIn PDF document text
    • http://vodova51-53.cz/files/43359751071.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/31901eba3728248d25861d6394472486/9523528790.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/4177edb9831490d61d593a33cf71bbdd/60800119919.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/xasew.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/49535252007.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/91466454583.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210902052116.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/rewixemijopapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=my+puppy+is+snoringPDF 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_off0000dede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDE 10196 bytes
SHA-256: ed4cefd5f416371fac905e01b485dea8fe8020b9d1aad633caba100cd7195cf5
font_01_sfnt_off0000f5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE1 18312 bytes
SHA-256: e36f4b274fddb3e59a62b772fd1fe8dfd16a19355375f4d2b6ea0d1757582920

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