Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2adf2a7675275d9…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 00:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cc8bd4cfc72fd5cf26fd073b4afb622a SHA-1: 18e1fb9e5d3059f52def17441cb25ee28e667a81 SHA-256: f2adf2a7675275d93982c142ee88386b5da58bc07ebac99b843c4b081751db4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery mechanism. The file's structure and URL patterns are consistent with efforts to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/efadde664c8cf96dee50d73c18940c4d/jufuvinebenofezozum.pdf In PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/43215110119.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/jajolojenivifinirige.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210907034619.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/zesekosaxojisusi.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/xijipifonufumu.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/86531033792.pdfIn PDF document text
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/12660034004.pdfIn PDF document text
    • http://jewfri.kr/files/image/files/nafolapivofukobibozame.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/83059874617.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/14166390981.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/8159602409.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160f0cdb0045d6---mutinafufemenokivofobak.pdfIn PDF document text
    • https://egca.fr/userfiles/file/9962333987.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/renegifopejirev.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608033717b6bb---pikidogiridejubebanu.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/ritibusedekivaroxokesiz.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/81518872361.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/lomomesokotizap.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be3ad12500---97399626826.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1cf0125c6---dobafaxiboruguboxuxu.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/82956002444.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/41341694100.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/watusalup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+florida+project+script+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_off0000e1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BD 17300 bytes
SHA-256: e33c6a1dba05a5479ac8b5ecb2a345a81a0c2e6692e7765cc4e849887ba1a54b
font_01_sfnt_off00010e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001267a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267A 10704 bytes
SHA-256: 3d70d02e80ab128683ae63d80168de6f206c385bbec66cd5f1d9d7d25b7a762a