Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d7c8f82ac427780…

MALICIOUS

PDF

79.0 KB Created: 2021-09-03 19:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b2842d1d729f5675cafb328b56e751b5 SHA-1: 581048e80ebf919c594708653c03fc5f770058af SHA-256: 6d7c8f82ac42778080976fe5dd858ee7c84f53881385c2ba7da906acc577751b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and numerous URLs, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://quangcaosms.org/media/ftp/file/86689438628.pdf In PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/p2flqa49tqr5ou8acmhpit9gso/75732884651.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/19947635063.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/dagefosezufomidat.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/758aedf52147fa898b4cb13baeefc406/11785689774.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/vinuweditimubajedesel.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/94992864097.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080291cb3b8f---fegixileronetofimigugivi.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/7580b10ea62076cda5ee5945d39ef970/kuwudufelimam.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/28022923148.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/jewule.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/zuvaret.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/13532651697.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609829e611bba---88952710728.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b88cdb94---bugej.pdfIn PDF document text
    • http://alkanboya.com/files/file///18015419356.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/76194940320.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9833c08ae---komidifumetod.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/7c7sikkjqpcoodn6bjb3rd9do0/xizinibofefamoxin.pdfIn PDF document text
    • http://airsoft1.ro/files/file/magepuxidokudi.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb2a91717c---73648294854.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/5428298442.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/17598462467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=fha+manual+underwriting+guidelines+mortgage+latesPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210903/16306254718901.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_off0000cf74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF74 17804 bytes
SHA-256: 02fad0ee36f5e70a4b332d0db94cdfcf09d18e7eaba4a848bedf7d6661bfe630
font_01_sfnt_off0000fd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD40 10860 bytes
SHA-256: 982403845daa8badc4bc9e534f86c7fd632286a136a9044edf37c535e8d9d695
font_02_sfnt_off000115e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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