Malicious PDF — malware analysis report

Static analysis result for SHA-256 035665af7e3425e3…

MALICIOUS

PDF

95.0 KB Created: 2021-09-02 13:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2d6ac212c2e34dc66001e0fe59c7e394 SHA-1: d68fc2b5b4b40c96abd790a5294d9436a6881d05 SHA-256: 035665af7e3425e3cb0d5887e9dfee7d801ecac41bbbb23f01deb070ccb05efb
156 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://webmenuplus.com/images/file/disafog.pdf In PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/tisumetesume.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54e02a56fb---milowawidoxani.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/26429640608.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e3085133cc1d2a82956629c023dd9880/38705749994.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/59363222892.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/l1te9ssmn6fqi8mdg0apc6g72d/82799072153.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/92765648470.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/47602134791.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/88c7e2b6281fcdea81c000f89421bb76/rizared.pdfIn PDF document text
    • http://arslanemlak.com/E/file/27214953500.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/19322957448.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/15501774481.pdfIn PDF document text
    • http://advicetao.eu/pictures/file/gilabaluvemoxutebemisi.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/66951116982.pdfIn PDF document text
    • https://soft-print.pl/app/webroot/media/files/toladenegiziru.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c900ccb134a---11421580643.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/08598a576e16a3253ccd37070346d100/77109121458.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608878551f892---48149319633.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/234ae1999e94027b83f219ae6ad436d9/fiwojogapad.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16092b1aeb69cc---5475247628.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/47176227288.pdfIn PDF document text
    • http://rococosofa.com/files/files/65411917559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=eating+disorders+anonymous+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_off000109de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DE 19408 bytes
SHA-256: 32492160d1d262071d76e07d3619d148c9de04c7a8a7ac07fba5153029a9a06d
font_01_sfnt_off00013ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000154e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154E6 10992 bytes
SHA-256: 15f149f9c9bde5ba36484e120bc46a17c5744c58f3d41fe2ddb1e96c3d2eb2bf

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