Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3e008ff277da95…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 10:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0cd4e4cbe279f8334ecc234896c27730 SHA-1: fae85c9ec1c05408feeb8b791c37d3b0dae08f96 SHA-256: 9c3e008ff277da9513ea87eabbfe291d0c1f0414cc05217ec3084d9e7c3e5637
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to external websites, including those hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious or compromised sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://cloverdiamond.com/file/zilikomipevufokir.pdf In PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/54405757309.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef56e42aeb---32312468112.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/30548995162.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/nofisejo.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/5776746704.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/96687650586.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ddd9abebb---bajomebokibigozajeminid.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/zumojuje.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/6935f3b04bd90669f21bc87de06020f8/51000199656.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/ebb806d3ac9b6048ab3b315b0f5cd421/gutejikakuj.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/14644742422.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/wejakosenoj.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b5f156ade---13474846593.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/puputokufiban.pdfIn PDF document text
    • http://precisao.net/files/files/wamamoxenemusaxogugidi.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/torimixunibi.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/2bbcaf9fdf2cfcabf7b04b9832fd3ebd/vivilekaniwufapifesumekar.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8bcddea93---54725661510.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/rejisole.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161249ed6b641a---kaxirojepopipoliletid.pdfIn PDF document text
    • https://jambumanis.com/contents//files/nivomojixaforadefufame.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/b27a205ee373d956923f59d80192488d/sigibonarelod.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/7lbrphoe9besevbe6vft9ug22q/5769625570.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/jonezorosakelex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=avr+microcontroller+embedded+systems+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a901537ee9f---78491058411.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_off0000d52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52C 17676 bytes
SHA-256: 6d7889a9ec5d2e14a0303c3681315f545f7659f6aa0a571ff51a0c13cbfb7fee
font_01_sfnt_off00010302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10302 10920 bytes
SHA-256: 57033e1dba353e54d238d985d183f542250a4aba923fb0fe0774e5775d98f6e0
font_02_sfnt_off00011c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1