Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8dd816cd38fa78…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 14:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7d4d69aad2c9e4d3fe60dd5f89aa6f1c SHA-1: 9cdc6b5e411fa9b3566b25776b48783015c4dae5 SHA-256: 2a8dd816cd38fa78e0561477f1e33e44eb68ce6afb7ec341c6321a64fe585a55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the link farm heuristics strongly suggest an attempt to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/brpsaq9kr9qgko76s9kp7nc6bs/33153921973.pdf In PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/joluzut.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/70332130093.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/545a575c8c58cee49f2ed4bc0b620a76/gifotixaromutanurebe.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/2232105.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/1919101733.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/nitejenulim.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/jmv04pui7nbgde149l256r1vdu/bujafatufurotinunosimatit.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d3a16f11f---wejekukuxenejobor.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/6920408582.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16138746e69cb4---kutuxasuw.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/waxepujevazojurobuwa.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/pebofaza.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/kewexorobi.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/rorawopokizabuxeti.pdfIn PDF document text
    • https://kaparatt.com/images/File/36642664721.pdfIn PDF document text
    • https://red-adlay.com/upload/files/pisevezeranojisik.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16135c95241faa---81262567999.pdfIn PDF document text
    • http://ibb-online.ru/f/file/tibogonugewuwafox.pdfIn PDF document text
    • http://gyliver.ru/files/files/durutakuzowifineluwezew.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/xitup.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/luxesirabe.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/31675872500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=best+online+survival+games+androidPDF 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_off0000d43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC52 10808 bytes
SHA-256: 5af51bb8172f711e7289b13c6814bc47c5fa3848e1aed86377a42232d8e3fb60
font_02_sfnt_off00010514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10514 17700 bytes
SHA-256: bddd7faba34798f7128a7d978b5f1d841894b85e000611ce81b8cad639bf3229

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