Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c341d274566c39…

MALICIOUS

PDF

85.3 KB Created: 2021-07-10 05:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a6c1350e01b9a1b00c6e0f26ad809630 SHA-1: 1b6658ca48294c8b6175f20639e6edd3ba860d38 SHA-256: 84c341d274566c39d5208c81a3f7c5c4b51a03b21d7c64ae2af586fc832d2951
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links hosted on compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7abddc4a8---50070492261.pdf In PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/4k1b0rueuov5id5m5d0m76kb87/bujaxuzowuwezogaxirek.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/fipabasojogoradawute.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/fffe2f3ad831d92624f56b3b3f052385/gofaxarariguxof.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/972aaea6b928e1ec4eb5624e0d269c7b/vovidibebijujaje.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a244f494cd2---jigojifufipojuw.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd59d69257a---69051846093.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/wofag.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/gadili.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24ab291278---woripekukasabevut.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/2af9b289fbbbe3afc56dbc6fa160d778/43593290882.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608095f20c5a9---28245798539.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/56878321556.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5bb148cdc---werisobadefon.pdfIn PDF document text
    • http://northcity.rs/slike/files/19529356771.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/11637989651.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/dd4e0c2eb7e1fbd5e5fbec8af25328c5/33014598547.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7a75347d3---zorowexalowalerola.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbd3297be9---52125355802.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/94e146de6cefe26b7ac379406a322102/73935085378.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/pebotovo.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/gekonanale.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/fj4hfb986k99vnbgeafau7hhb1/19930641459.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b03a4c78428322f20558337e9a9c2c3d/28064307454.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/noxexupejavo.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/38sgjqrmili0hr1aoqhnhhl3v4/31896180913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sacrament+of+penance+and+reconciliationPDF 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_off0000ecbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CE 16348 bytes
SHA-256: 4ca27c828a13973cc70e61877ee66ac366cfa9d5d3cf299f27ba2b18dbb1c641
font_02_sfnt_off00012f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F19 10688 bytes
SHA-256: 5fb9765a06b04cc628f2544dffa0301fa667a82e9a9f0521b96a62345f64f5f1