Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec3eac7e11d5acc…

MALICIOUS

PDF

93.4 KB Created: 2021-07-27 06:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0fd7c9b9849970f37f8d083a268d6cd8 SHA-1: c3a17e3ddb08769887d14e0af932aacc73eea5de SHA-256: cec3eac7e11d5accdcecd36bb6a5802e5fe9e0bb42909534f9f4acd72347afc2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites, likely to host further malicious content or phishing pages. The presence of multiple links on disposable hosting and compromised CMS uploads suggests a coordinated effort to distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://maudchristan.nl/ckfinder/userfiles/files/89337027188.pdf In PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e19306f7c---diduxipewusedikovi.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///zulavedojoxefadofamu.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607942b884d26---vidofowoneno.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/5ah1hhqh5jagv7g51q6gl1a9oe/dowolufitudekojodot.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/vifunutagatumivebil.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/nikutamidorabepuvusofoxe.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/30667619550.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/60034943136.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/zubenabubapakufo.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/58520724080.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/tisikeginubomipene.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/58919487748.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9b207eca9b15238e99d76e0689614bb5/xizug.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/bugenurotiwijupowabokib.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc679a70bda---61507091497.pdfIn PDF document text
    • http://dges.in/userfiles/file/48149586754.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/rolulidabutoforur.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a794905c904---55260304299.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/7af5248458cd1dbbe5e85179c455a048/foriwugabofaboxilo.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/daxokamimalotex.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa392950c---49884632673.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/b29c0b860d221b0f6c9ef949a4731708/98764047769.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099897919e39---21062629092.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072b330355be---gufojalokosifevojulomeza.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ee3484852---61859662572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=polaroid+iex29+manual+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_off0001061f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061F 10884 bytes
SHA-256: b62c4415c138a7e8c00ad0676516e097fee6c791e93013df53574beec92e504e
font_01_sfnt_off00011f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001375a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375A 17860 bytes
SHA-256: 468d8f4d55f214b43eda48097bca52baa55d1233f02bfdcd1149d57dea3c9f72