Malicious PDF — malware analysis report

Static analysis result for SHA-256 c718c61e5c2ec988…

MALICIOUS

PDF

78.1 KB Created: 2021-09-04 15:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f15a278f1e4a380f2f606b895319eb23 SHA-1: 505514cf06553efb5d135bc70017dac269267727 SHA-256: c718c61e5c2ec988323bef4e962cbb572dcbe7edb4caa15c42672bc6c905bda5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.atsamuihaus.com/image/upload/File/94276582004.pdf In PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/f7425bab1435116fce1057405930de6a/22604290599.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a7355f0a5e9845268f4048d0f7d6f581/rivexiginagozawekugov.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/selawejiduvanokopituxa.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/79950450dcc06b5c7b32c9a6db749a89/bizagimerugorata.pdfIn PDF document text
    • http://rnralpha.cz/res/file/vasudofaxaxes.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edc7e850488---dugaxofeduponufi.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075f19697a42---kenixawupasodukipi.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/60159110922.pdfIn PDF document text
    • http://immopolignano.lu/images/37728839280.pdfIn PDF document text
    • http://sgpeo.pl/users//file/13907709033.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/makor.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161248abfe7022---juxoxebezukazoruxifilo.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/pulaj.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/c35693fbda5d0497cda3c5af644324d7/nuxowijupokijivu.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0ad44367---fezugisumujowedexati.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c023e8dd32c---gizulenigagezironexoworug.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/zevarajuteboj.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/38130624366.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/e478db550eab37e7b6b316f2718c565d/85484957331.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/88b583e19894e385f859d71f7656fa77/6532128585.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/sabigiselezopevekagumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=difference+between+teaching+methods+and+strategies+pdfPDF 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_off0000cc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3F 11248 bytes
SHA-256: 8466d9c777a9f1c62d7ad6e7ec898e256463c68ecca6fd73e6fff97df0863b77
font_01_sfnt_off0000e61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61D 17284 bytes
SHA-256: 4528c1890a0c6406b8995d28c0ea930bd11f05a44ac547dc1dc9393c9b5c2df3
font_02_sfnt_off00011262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11262 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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