Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d13cfc6aaa3dcc…

MALICIOUS

PDF

117.4 KB Created: 2021-09-07 13:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 41d36ca56e3fc17bc08fef5fd9271140 SHA-1: 47bceadd65f92170fa3ed386ebbeda95e48e66a1 SHA-256: 50d13cfc6aaa3dcce70615215b5965eb8c77c8b1b895835c3460ab7e820180d6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external websites, with several links pointing to compromised WordPress upload directories. The primary attack pattern involves luring users to potentially malicious sites through a collection of diverse URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://dodomacnosti.net/data/file/59465665913.pdf In PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/47911307040.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/50511362808.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c607c59027---xasimapotelatuluxamu.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/72261269465.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c94b6feade4---59900345967.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/25493779389.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/zisakekukiponozumusof.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/5jborf79g2c4mo6eq4d3r9680h/12385901594.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/tevetomibivetokali.pdfIn PDF document text
    • https://www.crqp.ch/ck/ckfinder/userfiles/files/zotenuw.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b1a5ea061---41586262555.pdfIn PDF document text
    • https://limsurempat.com/contents//files/polozanoja.pdfIn PDF document text
    • https://bbdirect.com/ckfinder/userfiles/files/jabozugafu.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/luxefixufutinal.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/11945224024.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864e1c34e04---nasovaxiweb.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa051035f20---didufalobazikegimusasu.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/fonaguxisitakumeto.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ae1bb48d0---gafepolupudukujabat.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/nomipezujananewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=contoh+karya+ilmiah+tentang+sampah+plastik+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_off0001680f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1680F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18021 17824 bytes
SHA-256: ed370e719ee4e0b065f131caa45dee840a4b4b5d7fc13b61316b47c7d0bf27ac
font_02_sfnt_off0001ae16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE16 11184 bytes
SHA-256: 6062dad9f7af5993da6cc524588089f69c77d5a709a2bcb606cb02b85edc1d65

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