Malicious PDF — malware analysis report

Static analysis result for SHA-256 706f742810d90dfb…

MALICIOUS

PDF

87.4 KB Created: 2021-06-25 19:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5c81dc6b9bf165afe70fcb0adc2cea4c SHA-1: a12dfa68af8aecf3499f66311951b5e2e7008a1c SHA-256: 706f742810d90dfbe8a83f7672b4ba7080bcca78da3d8bf9dfd87f1b67d31f7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=energy+policy+analyst+jobs PDF link annotation
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160af7f0364539---80687447928.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19feb3b8be---39108771275.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/3310dadb9906d78acd94009913c2b4f6/lesaluwuxar.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/v2ic6vo67vlh7br6rpnmjcqrl1/mukuxa.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/gupesajagebogivixaf.pdfIn PDF document text
    • http://greenbrier101.com/userimages/72863578079.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/88920084048.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/2cee6468a7473c899a362c5879c86155/jupafef.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-22/20210522013529993096.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/o5h55erp91s4ne2t4jufafbd6b/wedalujebeluteji.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/3cspcnl1hv5k4osq3bdecc03j6/sumagutewi.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/daxujukivowonazon.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/e817e77c022789ad0383cd96bd486f65/46711513944.pdfIn PDF document text
    • https://actorconseil.com/files/file/jubofazidulizululof.pdfIn PDF document text
    • http://medipharmacompany.com/userfiles/files/mepupopofonira.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/mutidikobaxiz.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/limorozogudopokomisala.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d002914c78f---77464511547.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/99fabae41698172ef698a048c6c293ad/99839186701.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb480e1d89c---82906208223.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/32651696094.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/dakerimami.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/bufoluviki.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c29fa9c14e4---43592280333.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608676a80d7a5---bogajejanaxomejig.pdfIn PDF document text
    • 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_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 10916 bytes
SHA-256: 36482d33b77e60a655adbbd7bbeb01d85640d62b1bfad68eed1000d1d9f90ab1
font_01_sfnt_off00010b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12329 17280 bytes
SHA-256: 5430390d5e5418aa643f6175f9d4d070362f813697c97b7974be739549a7387a