Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86a6231d5438f48…

MALICIOUS

PDF

98.2 KB Created: 2021-07-08 10:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 103919237f5e1c32c40092465a6c7a84 SHA-1: 8d57f150def87786ab12132696b0540f1e05403f SHA-256: f86a6231d5438f48a7ac52caae51c952804313a4a4a2c0e89417fb9ec15895ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 http://bephoangdung.vn/uploads/ckfinder/files/71236680467.pdf In PDF document text
    • http://csc0535.com/userfiles/file/20210622234847_gnoxsk.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/5092ba8516fdd144fcce19bb207971cb/kaneb.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/tufemix.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64b2fefcf0---tazurej.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/15c9e32e42d956159dca815fd70b564e/89418368590.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/962598dc1977cbeb211533267d4f70cc/xadivoxopit.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c63090e40---80212922925.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/lunixobudo.pdfIn PDF document text
    • https://spacio.hk/attachment/file/tegipojola.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b00c1c1d---xigebudom.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bec672c90e6---90999315934.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/zanukudafotorezibivuvaxu.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/pekuresibizeg.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/88744849514.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1619d558f---51971731952.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/edd9518c53ea0c558e27a8967b637a4e/wixezezinibu.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/rexil.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/89196165266.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/k1f0lsg2auhsh0is1a2dku5nr7/fiwujaforebapavifut.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889774c2023---49061017792.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/jeralunisanu.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/12422418128.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/97a6d41663684eeb42f777b14ebb0dd6/kadalexopufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=charlie+and+the+chocolate+factory+full+movie+free+watchPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000febf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBF 19172 bytes
SHA-256: 63dda6ec9c18f89ffdce308dcfbf1a5d2bff632f8fb7af08c6859cee66909632
font_01_sfnt_off00013169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13169 16732 bytes
SHA-256: 8d839163a044c5a229aa92abbb3030be13840ad39a79f32dd9c29cff439fd2db
font_02_sfnt_off0001492c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1492C 10972 bytes
SHA-256: 0a94636a2aee3265514292f13fb183d0fb85d95767ed4100f0f66d562dffc360
font_03_sfnt_off00016282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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