Malicious PDF — malware analysis report

Static analysis result for SHA-256 556b7a9abb1538ea…

MALICIOUS

PDF

82.7 KB Created: 2021-09-02 20:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e3e689999c2ab15ebc489c4d5f4bd4e5 SHA-1: df00d9240d6d9c5786d2f9f8a298605d05ef9fb0 SHA-256: 556b7a9abb1538ea96ad850eba3e83d40e19104f4cd0e8f8eb9274b859994c2d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised CMS upload storage. The PDF likely uses JavaScript to facilitate redirection to external URLs, which are part of a link farm designed to obscure the final destination, a common tactic in phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mxm-hosting.nl/img/editor/file/1959243414.pdf In PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/pipokawil.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/kifegov.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/kotumivoxowusewafoxetu.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/munoxogedulezepupisuwa.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/jereg.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/sajulonowe.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/47510054696.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/tixemituxu.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/27382191935.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/54816623128.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/62053525734.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/titujubafa.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/duvobiwamokivigagub.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4b0b8a4f0---33428976246.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/pozanetugotutenejuzu.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c906c088ad---xoxolazefazuxu.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/96714767a0b6afc469c6efecf5b1822e/dabagujegisokefazafum.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3ec2d4ab2---48028348731.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/topaxijadajanopurimawazaf.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/40370539276.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/20832514541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=algorithmic+puzzles+pdf+downloadPDF 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_off0000d83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83A 19488 bytes
SHA-256: ce0c053cf31590d25844ae69d904548f21b8a5cb9548ef354d797fb558f0b4eb
font_01_sfnt_off00010b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12356 11296 bytes
SHA-256: 5a8f41ad378168922e90e8cebe46c026314af4f5f4732cad6a9fe318003afba3

Open this report in the interactive analyzer, or submit your own file for analysis.