Malicious PDF — malware analysis report

Static analysis result for SHA-256 211caced9e4faa59…

MALICIOUS

PDF

139.6 KB Created: 2021-06-29 01:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d015ec1f5ccaf230fb8dd71d8aacc388 SHA-1: c96990eaec4da531bce557833ace02e9752bb83f SHA-256: 211caced9e4faa59cdeb987e7a9fa3a4f8d07f68aaee81479d605daa3b448ead
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to potentially harmful external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9807

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://pistant.ru/uplcv?utm_term=kinematic+equations+for+final+velocity PDF link annotation
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e409913935---51269167811.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077479233897---kapedumawuxilugawedimalis.pdfIn PDF document text
    • https://synersys.fr/contenu/file/fikubagevepad.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608569a7f3a5b---50705645046.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-1/20210601091008330519.pdfIn PDF document text
    • http://flexa.cz/docs/file/64584531152.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/f99ab65d91146623c4716073b6ec25d2/jedaripexew.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071585f954d8---73807538718.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/jululuvig.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/sopow.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/fcrsd7gfgmg742vgqe8nrkbg1j/lizotefafarijajefazugi.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/veloxenomitesugovolaguw.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e82e1b54bf---xaxoxureborij.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/2pji0ketejq1g26q528iei41k0/37785824614.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/madebifajojuwiruxoli.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/bcatle1bcksuaq4tcndqfhji7r/zukezinekenovirudik.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d2aec4da3---61146394378.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/4satnr7mj3q0b4do8h0eb6it6h/61355344370.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c863f88760a---babodezasorevowidamovaji.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/7181734742.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfc8486e29---dudurojodim.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/xodogemog.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B61E 10912 bytes
SHA-256: a8af1e5d861b174eebb02d2af254d5ee34b26db0880e9c7475dde095738eeeaa
font_02_sfnt_off0001cf71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF71 22172 bytes
SHA-256: 2e512753ff086072a84d9ac752e00f3cde8aaa18109f74adb62019295c4f4fd9
font_03_sfnt_off00020b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B37 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c

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