Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b317d8e69d1edf0…

MALICIOUS

PDF

111.6 KB Created: 2021-07-28 11:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70725096e4aa94dae779fde862184266 SHA-1: e45b60aa3bb15209a5c540d60ef5624ce44c31b4 SHA-256: 8b317d8e69d1edf022e74259ea01d75366191b6892642ce9190067137e983d53
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or phish for credentials. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://101doctor.com/uploads/ckfiles/files/60b6b666888b9.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797507292b1---52988368005.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cedb1577a3c---27076456514.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968dd188ece---26350842509.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160960d76bd596---106471528.pdf
    • https://zzwgjx.com/d/files/jedodefurumakinak.pdf
    • https://rpdev.org/ckfinder/userfiles/files/xowiduwasepani.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/782779bd7ab34e5419064cd9f3ca3389/pigobipulixagureba.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ca664c103---dubobafezotu.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091940f49cf9---36944206621.pdf
    • http://architettosbaffo.com/userfiles/files/lakinokuxugiwusi.pdf
    • http://auburn-properties.com/userfiles/files/82824125472.pdf
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/lakarasop.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b5d2b86660a16b24f0ae1e89796444a2/25413878876.pdf
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/022343549933.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b0bcd513---8567746899.pdf
    • http://absolutelyneon.com/userfiles/file/libotifojuf.pdf
    • https://blugarden.eu/file/8681704944.pdf
    • http://benevolo.it/userfiles/files/wewubaveduwa.pdf
    • http://bioterapiazabiegi.pl/obrazy/file/93213162297.pdf
    • http://sns.hu/_user/file/kumabename.pdf
    • http://musicpark-live.de/userfiles/file/60961536135.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56439a5514---walabemovete.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+i+access+my+saved+items+on+facebook+marketplace
    • 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_off00014e0a.bin
31aedfc9a1cee6b8f4c095bdb71c792b0f55fb2c2cc3f14f76c318317dc73353
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E0A 17740 bytes
font_01_sfnt_off00017cc5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17CC5 16792 bytes
font_02_sfnt_off000194dc.bin
c37b63eb2cbe914917e5f17c34eabb77d17da11bc8a8b32b4a1a9ae825d0b03d
pdf-font-stream PDF embedded font (sfnt) at offset 0x194DC 11272 bytes