Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4206ec5aaadf502…

MALICIOUS

PDF

100.5 KB Created: 2021-07-17 02:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cf5cf4e8d4bf6c8d3746f01fa0a8cfb0 SHA-1: 75da6e5fe534c4a4e5705ca66876622b1d42b409 SHA-256: e4206ec5aaadf5021dc52b872cce655fcad24be026bb26a4e82b5ebda7e0f46b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9730

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 https://limblength-sldf.com/userfiles/file/jojizujibipekopunogi.pdf In PDF document text
    • https://armagedonspedycja.pl/files/file/lilaza.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16086ddb8f23ee---877674350.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160ad4437dbcce---80730815820.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/11537240643.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/28513655845.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16078159c63943---xaxibalarutojojaj.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a62209834---betezalidagasiwuxexuxatil.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe63a44fa3---8508316028.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/km6eeh9gn9vr3s5fb30cdvje6l/boxijelunovajawemoruwo.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/de6d6bab8f99a280a4f3ce03c2dc9dee/21767935021.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/jniqm5a86s3ljhrkf77l8dv7c7/1186671525.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ed694144badda0caaf96a29a08551b4/16385697008.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160768bf6028d4---44029845537.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/kozisazifuzedoneretesig.pdfIn PDF document text
    • http://canvangdientu.com/images/file/bebekubefu.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb7baeca9b---91323338001.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/12470398396.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/4e14e6b20ca1e5f0a2d3813aaad3fc87/5371671376.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec563b5430---tedugufutawapi.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1aac98eec---mofimido.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/v0q2m72j8a780madb2f76mbt63/vakaxona.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b50d4f07d51---zabajage.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-24/20210624214354758464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+does+monolingual+meanPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001098a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098A 24092 bytes
SHA-256: e6c5264819f0034b03f6a8e082d474c66ffa5e099d23192b4b7de5bbf24ed145
font_02_sfnt_off0001472e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1472E 16972 bytes
SHA-256: 5637b9cf633c49eabbc90a47a3537f6c5174ad75e52b34ee7785757a5e289d92
font_03_sfnt_off0001600c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1600C 10688 bytes
SHA-256: 2d84a3307a3af89068c776defcf7d572f2c65e9cdbbf9bb38cbc2e1a145a88d5
font_04_sfnt_off00017821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17821 2940 bytes
SHA-256: a823be23657a5b3cd1faea7e22137aabfc7f53237b0badf4cbd030553c8a3d1b