Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52ff5f81177e942…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 09:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1aec12e01912632fce795b1fce99de1d SHA-1: a0706db0cc75da712e910a06fc4c21ca3e5bb355 SHA-256: e52ff5f81177e942e850039382824e38447eb811980c9a5a26a252aff1d0eb75
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to other PDF files, many hosted on domains associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://reniuved.it/file/naxulowa.pdf In PDF document text
    • http://accessprecision.com/userfiles/file/piwepemufugafuboro.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/porevetodotevogonala.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/gexivosigitapum.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210613083327_gzujja.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8032146e7---punetezodujokejijuroneto.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/dekasunipisipemoserifi.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/f530a10e930585f89ff6e4f979c45da5/21619129158.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/nenozipekipi.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/vazadejikan.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b06a305a9---rabokabasu.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/4657355231.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/k2hsmludtn5ef12bna0rtlshvc/vufututovikexutovodegelo.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/sekemo.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/aqboqms8caamjkm2l2dvvhqnur/90831100772.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/43028493506.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ef941a47f---pakavebofaterinum.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/80263545677.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/lapox.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/menanifanulamisez.pdfIn PDF document text
    • http://lucann.com/Upload/file/69425892263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=abstract+and+concrete+nouns+worksheet+4th+gradePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC860 22304 bytes
SHA-256: ceeffc72d453628e6399c47a9955e377e72e923b346dd5ce754ffe033dd3c2a1
font_01_sfnt_off00010047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10047 10988 bytes
SHA-256: 629baad2c7f04f5bd902b8bcb0ad135c2514b61488794b7175c0a8183e13df6a
font_02_sfnt_off000119bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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