Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e9228f2413b582…

MALICIOUS

PDF

95.7 KB Created: 2021-09-16 14:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 39812b39717d3cc64b08a186f97cfbc5 SHA-1: ae7b70e5b1182595ee83196c2f3bca455e549f14 SHA-256: 88e9228f2413b5828bb8214801badefff71e830ddcd8a897a28aa24794f29ebc
196 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to compromised WordPress uploads and external URLs, suggesting a phishing or malware distribution attempt. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser update or extension, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://infrive.ru/uplcv?utm_term=app+icon+android+generator PDF link annotation
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613363c4b7e08---65541914595.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/b945b9a7e508789927602c04c53b8ace/nefukaxapazufajafufov.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/nazozijenunopapeja.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/nibajebudubeturidajudovaf.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/40927947559.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/zojuvo.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/fegilewe.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/lepam.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/75015776971.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/zilobibuda.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/6117259906.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/tubenedakudizuluma.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/vuludok.pdfIn PDF document text
    • https://proxus.nl/file/56537914883.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/80036813811.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/bopufofeso.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/18142548887.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/3377a5d9bc9f0bb8580a37331600be35/64265564630.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/nijevasu.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/jejijokojozipapozedete.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/nakapokiniret.pdfIn PDF document text
    • https://miet.hu/kepek/22017937341.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/63583512922703a2a18512389de29c7c/98882608033.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/puvukekidolizokomizusa.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_off000111e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E1 18168 bytes
SHA-256: d1a9b95c8c3a2316c6aaae219d757409c08fc8f1f427e338e915247d5b855605
font_01_sfnt_off00014156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14156 10456 bytes
SHA-256: b13265dbe2187d353aaf3bab09a5e449caa8615c41555fb1d8d0f39a90c51158
font_02_sfnt_off00015908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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