Malicious PDF — malware analysis report

Static analysis result for SHA-256 7927d2aac45b434c…

MALICIOUS

PDF

103.0 KB Created: 2021-07-04 12:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 62eda9046bdc7a3b1ca0cb17c3367893 SHA-1: 304d46062887de73e3c3bd9bbcc551ae21e88601 SHA-256: 7927d2aac45b434c66002be9e98ccb2425d8370ba3212bb1a22cb07748263753
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit users via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://capitolmetrophysicaltherapy.com/userfiles/file/zuforefi.pdf In PDF document text
    • http://medicapoland.pl/uploaded/file/norimututawamakafux.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/ac1e2e4b46c7cec0d7e5e5bf8ff5ca06/91134937435.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/4d20e01721c536bddc833cc7c90b3120/41527359727.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080a3eab9edc---91197273552.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd7921d07b---javalikolavi.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160822bbaed7f9---44480152079.pdfIn PDF document text
    • http://toyotalongbien.org/data/dulieu/files/62290441634.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/30313896009.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0d9dae69---89371097936.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/36295498584.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee2d4cbf3c---fiwopegorane.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c921fb4ad6f---femufokuf.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6f3c58aaf---vigopibara.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/19389487281.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/8af5181d81797943590cfb64f6fcc6d8/88698821299.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/45e34bacd982f96f5cf7a94af547c261/88920001435.pdfIn PDF document text
    • https://pasarantogelsatu.com/contents//files/suwezi.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/jozejezelofozedowire.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/kitoz.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/88354012900.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/davofolivefukadafixawir.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160adea5a4bd8a---47514278514.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/36076572483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=what+does+groundwater+flow+mean+in+geographyPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/23633300708.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_off00012e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1B 17036 bytes
SHA-256: c9d646a3e9a9b029a53486fe95fbeb1d1d156e858c0684e11087ded8c32755f2
font_01_sfnt_off00015a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A9F 11236 bytes
SHA-256: 89c80b38989a730377d1002bf60e59f7b951ae53a337c0227e48b7b697e35eae
font_02_sfnt_off0001749d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1749D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1