Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec887b1abec2030b…

MALICIOUS

PDF

84.3 KB Created: 2021-06-28 08:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: e6a38978a236bd237fc5d8611709bdc0 SHA-1: de3ac2242d39b08e187a126e8b5c47cf458ee5a6 SHA-256: ec887b1abec2030b80c5a4c1abb1d469dcb9e5d68ca60afdd79fbbaccda98502
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, and utilizes UTM parameters, suggesting a link farm designed to redirect users to potentially harmful content. The primary function appears to be directing users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=bachalo+mp3+song+download+ringtone PDF link annotation
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/niferetele.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/0b38n5u8gs6684rmljveki1c81/6084383912.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/3181a528e3764303f6fde182f76d7972/18128147426.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/d1666d744e7de97b60082dc29df9ac94/xunut.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070646e8fad2---92157673484.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096c4b6464f1---tumukozokapijekebixuza.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082eb8877220---33874467461.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/62120802561.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/sonujilivibosidaxiwene.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/11537364960.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb717c95bb---buforawakaj.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a09a98a199c---85382773264.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a791bfeb12f---6763676422.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/30714088580.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608690557ad57---sifuvinen.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ae51f77003c0039fc1ecb2863f997222/3001726729.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8db3d9af7d---95056672913.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6bdafb75df12755e908d3db81e862bf/84165204419.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/23f47f6f0af45d16c2701d91d373246b/21680475754.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1db85d0ca---wojaleporiforebomijasusob.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/xokomikopuxejubexa.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/makewupomuxasupap.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160780bea173fa---vogumevaxinifok.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_off0000e691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 16572 bytes
SHA-256: 02f91ff143a6735787b9ecd1ebb00c6aeddf7cd757262313307224805f0c11bb
font_01_sfnt_off000111c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C2 11272 bytes
SHA-256: 9ea2e6f2ae146cce99d27bc547e688a21bf7fb7074c57ee687119e9a19754134
font_02_sfnt_off00012bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1