Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb571967aa87b29…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 02:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9cb003d0de916c281c9c85487d101132 SHA-1: f3df78b6c72cc0cf05d72d3b6118859f3115e726 SHA-256: fdb571967aa87b29bd983e1bdabb1ec6caa59c19e78ce0ccc834f3c43f93e537
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. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites and disposable hosting domains, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://irlanc.ru/uplcv?utm_term=assessment+test+questions+and+answers PDF link annotation
    • http://ylpqzl.com/ckfinder/userfiles/files/dokegojanajetitixiga.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/028243e6b4f1c89d8cfede756a509e3a/xafebedikulotimifoti.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072cbefd5cf0---23709250208.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/fotarifafuwira.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/lufafuxoli.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/fularubokepuzojavifanudej.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/uk76fnn0b4j5r7dpdso2hmf002/wewuvaxogizut.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abde13738e4---58775919028.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/bakesakagepeboba.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/25474be9e029545292bf227bfdebf20c/56348503778.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/funov.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160ade493daebd---kolurisazulexilebuvex.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/95d76e3f7e175c76b6ff465b901e77d3/80895052102.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/japolokisanide.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/dexusa.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/55220954155.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0e6c91a5---93967592830.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b0c09dc72---rakugep.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/dezovizotaxomava.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/mezirorutaxiwe.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160986ea2dcb37---82309408542.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/8368672462.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/99330000221.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 18592 bytes
SHA-256: 0ca9d92339b84443c1a14b2f0518f60d3a0bd169ed4864f24ddd4124c11bbcda
font_01_sfnt_off00010c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7F 10676 bytes
SHA-256: 14ce529a1a1251e600efb6b0e1d133ceab71b3bc947ef754a7aa68d9ad4f2fe0
font_02_sfnt_off000124d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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