Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd489cc7c31210b0…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 08:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 218b360b473ebd2654f0e2a4b24e849c SHA-1: 53f9d3caaad24eaa0cd09843483792950d81c5a6 SHA-256: dd489cc7c31210b087bf28f0555d08b692ae0ad69082bd64f58a8b4604e56c6c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614137e1c751d---30382373057.pdf In PDF document text
    • http://apisicul.com/userfiles/files/ziviturire.pdfIn PDF document text
    • http://4darchitecture.org/img/all/lififezexurapep.pdfIn PDF document text
    • http://labonscafe.com/userfiles/63166174435.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/93755140119.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/38218463780.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/bubukefazetarokexele.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/25761168018.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/48649965187.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/xuzawiguwabovuremedasub.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91785420173.pdfIn PDF document text
    • https://sapthagireesyathra.com/userfiles/file/29794023992.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/86771341924.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/pupaginugifoxat.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/c5m0jao3pqfurvk3ppff875ehr/vokitasusege.pdfIn PDF document text
    • https://migger.dk/userimages/file/vujonevepulet.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/juxigifajevuxapenagebum.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612faa34353c2---dodegubobe.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/patorekujubukikuzunal.pdfIn PDF document text
    • https://medius.sk/userfiles/file/4081795394.pdfIn PDF document text
    • http://premo.at/userfiles/file/6563771970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=benjamin+graham+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_off0000da8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8C 10696 bytes
SHA-256: 1022e493eee3ab53a16c506fb10020724d9f957005b25ef10cdedea44be13e70
font_01_sfnt_off0000f287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF287 19164 bytes
SHA-256: cf6c726f5d5be14ca34feaabd7468fda68240e11e27a7bf5a969d956f9a6ba11
font_02_sfnt_off000124b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1