Malicious PDF — malware analysis report

Static analysis result for SHA-256 904a0850bee68497…

MALICIOUS

PDF

82.9 KB Created: 2021-09-03 14:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9525aa3844f8ecd9f50a11751da7009a SHA-1: 3cd220f1bb4a74897c731e8e2d7366dd8830be0c SHA-256: 904a0850bee68497c798e9f1b0ae46e27ea54829d5218a7697b30396c9cc6349
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure point towards a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kutscher-customs.de/gfx/userfiles/files/nosoroz.pdf In PDF document text
    • https://appvid.eus/userfiles/files/wikezeluwojinimunasa.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/15819081684.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/dc4s4r5pifmvetdlp41mkl9kif/savaruzuta.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/jphftj0lgrb5j35qecr6oui6ju/lufopanadagebapexu.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/49645271466.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/sawedolixovonikusefiv.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/guxuxonarevetefarofa.pdfIn PDF document text
    • http://samtle.net/ckupload/files/pewetudamama.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/larerixikizixabagifase.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/zugokopovamisotosen.pdfIn PDF document text
    • http://ned.ru/uploads/files/73502266224.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/subodenojelepuxo.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077cb6ad08a4---46122518822.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/xugedovijuganotaneluvon.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/15219648885.pdfIn PDF document text
    • https://bio86.net/fichiers/futimoga.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/59037702580.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/xefuziseguwowufubarexakub.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/88718608481.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/796f93435845690303b937db39be9631/74350148924.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/4c8aa3b2f02eda0083c9a686e3f28aac/xelamulazujemurotota.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/futikupekulexoto.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081c533d45e4---70019956445.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607348d5607b0---65767113044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=here+i+am+lord+sheet+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_off0000df96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AD 10652 bytes
SHA-256: 5ab8b6570fae9e5e1850669226596c431a68835ff854b0626f5c518e0958da92
font_02_sfnt_off00010ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFB 17728 bytes
SHA-256: ae0b0d8610568a2c04bbb609763feee1d03ca1c8dbce61c4fdb45310932c445c