Malicious PDF — malware analysis report

Static analysis result for SHA-256 4253d1e43beca684…

MALICIOUS

PDF

86.9 KB Created: 2021-06-30 15:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47a9c787d249580caf988c1dfceefe74 SHA-1: ae7071bce9d746366723ee1c6925e0dbd65c1016 SHA-256: 4253d1e43beca6847a23fea38dfaf3bd78b8a3a888ecab91285f243ae8af5762
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://project-lovcen.me/userfiles/file/tuwubijabudofeti.pdf
    • http://sarlampa.ru/upload_picture/23525526710.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/4b5be510a488bb80fde59a981e208f97/25337187708.pdf
    • https://floridainvestment.cz/files/file/vubozotafosulig.pdf
    • http://kojeneckezbozi.eu/userfiles/file/kikibagusesob.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070468874ee3---javegofujeparoxidovoje.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/b29fe10db77fcae272a13087e75e92b5/69955569484.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f801096795---fimemorilepebonewowose.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/e7ebc03d8e753243beabe5a34f252c76/43260499077.pdf
    • http://amirafouad.com/uploaded_files/file/73854932060.pdf
    • http://alhs1973.com/clients/64426/File/31746871424.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160daa566dcad9---77112496160.pdf
    • http://bualuang101.com/backoffice/upload/files/kofazekugafipodabaza.pdf
    • https://grandhotelbulgaria.com/userfiles/file/24108503819.pdf
    • http://brainbond.ro/userfiles/file/wefimoselezepud.pdf
    • http://www.allatpatikapecs.hu/images/file/90768649846.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608309f1c5cef---55319431503.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3934e40497fa9c0703a787ae9f34dd7/26297336860.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/68c083ab69513b359215b5475f0b6c5f/todumevoboxes.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/lleeopc1p4rgjv4orsb7qvausj/78854457046.pdf
    • http://color-gateway.com/userfiles/file/gefegeloxukajaluvavoro.pdf
    • http://aranykoronakft.hu/userfiles/file/ganajaxodo.pdf
    • https://juvelyrikoscentras.lt/Files/file/90427792220.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf8b15ab3---70248917400.pdf
    • http://freetourscadiz.com//ckfinder/userfiles/files/66356701243.pdf
    • http://donauwell.at/userfiles/file/bofajuf.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=nail+places+near+my+location
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 16792 bytes
font_01_sfnt_off000107c8.bin
6b0440e653537ac9c3bd1e9a4e5908067eafd7f3f62ec73b2d2feadb81dbd50b
pdf-font-stream PDF embedded font (sfnt) at offset 0x107C8 10628 bytes
font_02_sfnt_off0001201c.bin
b8f4322339a0cec47e08aeddb1d2b86d796525494df51a2446469c6e38cd0f67
pdf-font-stream PDF embedded font (sfnt) at offset 0x1201C 17560 bytes