Malicious PDF — malware analysis report

Static analysis result for SHA-256 361b22f598df0515…

MALICIOUS

PDF

88.3 KB Created: 2021-10-07 11:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c3ee49659b078c661cb3284306ff1711 SHA-1: 89abe6985f8f2565df44c18080568811fe8ece96 SHA-256: 361b22f598df0515bb0c51a0758c1dced5cf61ce9a9bf299a28a7327b27b9288
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://archissimo.eu/userfiles/files/rikanowavat.pdf In PDF document text
    • http://impex-italia.it/userfiles/files/zudatuxotimenokotedutuxa.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/fumafovotukib.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/88748493005.pdfIn PDF document text
    • http://recviem.ru/img/upload/96410203351.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/39140909977.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/diropokuratibezipetogatu.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109120721246288.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/zaxovomawolikidatuzo.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/padepazidejozi.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5o6jcl1u8hj53h06bt5prtqo0t/jemomi.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/29075301649.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/70954212939.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/2472301913.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/31553020747.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae6399c28---fokuvojekufikemon.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/97019153197.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c7efae31e---65176847565.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210925203614.pdfIn PDF document text
    • http://vipdiler.ru/files/file/nozojakunifutelupij.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/bd0b8eb77638fdf47225a11bd05166bb/dovadiji.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/5214249410.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/4470878087.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/70017212360.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615e6da411743---xoravozarajuvenosafepafa.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/82818419079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=five+to+rule+them+all+pdfPDF 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_off0000f301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 18540 bytes
SHA-256: d61b06651c27b6e652add35645e0191e10614fe7259aaf17919172b07f469b61
font_01_sfnt_off000122be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD5 10632 bytes
SHA-256: 39c896ac97d0fea449686484eace2decce2891acb48ba67a012494ec71cc40ac