Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a62799a81fdf890…

MALICIOUS

PDF

96.5 KB Created: 2021-07-23 21:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6c80ddd12bb5805c5a3aea1b35d54522 SHA-1: f4b614b772579ed3e6ddfc0c91c7dddb7eb35f5a SHA-256: 9a62799a81fdf890c3dee57030af96ba8dcbed9d150c25f661f9745cbcd36f67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload storage locations. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075768b5138d---sipobufuferujugawitaza.pdf In PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/tezebamopafonofigudumo.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0a86280e8---70385979405.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e242af355b3---narolagujedukerafexugi.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cba162bd5f---jobegokurewarif.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/97889906998.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/2876598052.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075fc766e2f9---52584929198.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/52681021765.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/82659929920.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/niladefemo.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/bh8tu1smgmau5614cvfsllff33/niremaxukomobaxa.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0037af108---pogavigebiderakukid.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3290418c8---85439234895.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/qmoooet9b3f3mo7s7ferpa2cth/jogenibox.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/piwuri.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/kemakasorebabovitubuw.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/litemususasanidevin.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8462d2297---73541028189.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/tepagedalozaruw.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/9a49268f9b6cd0ca5da4512b6f3a34da/35753348815.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c99c1422f---65683583724.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-4/20210704084421259308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=what+are+the+chapters+in+inorganic+chemistryPDF 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_off000112f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0D 10880 bytes
SHA-256: e38e3bcc8edfc7da2b46e46bd88372f7ee94c70351e987c287b1c266485136b6
font_02_sfnt_off00014418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14418 17552 bytes
SHA-256: 21dbefd4ff51e8e8087325bcc88becce7f47c7f24530aab32797af0861d93dd7