Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1f5351a96f915c…

MALICIOUS

PDF

100.3 KB Created: 2021-07-07 15:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bf15198fafcd9ac4410bc40e4f6d9c53 SHA-1: ad3e81d9718a24fee09d0d7a47165a23f09bf330 SHA-256: 6e1f5351a96f915c99b888a8f6a822e54a8bd8fe949081ba374fbf28e3031b18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing and potential trojan threat. It contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to redirect users to malicious or phishing destinations. The presence of external URIs and link farms on disposable hosting suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://chcial.ru/uplcv?utm_term=words+for+illogical PDF link annotation
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a1da4c479a1---tujezumufug.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/bb1739626eed6d84d7260f4e434d5db2/19665626902.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608466dc53ad7---dijigamutomorutifavuf.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/doxejumufeputafe.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/2482976720.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aada7597775---66102005517.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/4lnaqp4oit8ea7q8uneit4ng5m/66544420579.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/293f0db3ec00a0e42f6f153ae887e3d2/tovitorigibugepapugifa.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608572c7e8e80---nerazotomabege.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/noted.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a815bcd6a6e---43891321479.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/60319707761.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608140ad07e19---99029251502.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/90400ad3c398099dc43f01caa2075c1c/384967310.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/pasujobefuludaripefuwag.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/nusofopemanotepe.pdfIn PDF document text
    • http://banquat.com/userfiles/files/58119681002.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/92830887962.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/21ec0c7274cdbbcdd82c3f29d65bebb2/50743633968.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/fexoseruxosifi.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/36385402793.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/38201412433.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b056c248a8---88744627540.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6719e9fca---26726929082.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fbbe9132b---57781766773.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_off0001279f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB6 10308 bytes
SHA-256: 400f32bd80f71f124f3cf91f36fd9bc3ac8a6b44efee3396bac82e17b055b8cb
font_02_sfnt_off000156cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156CD 17524 bytes
SHA-256: e865257ef90140cb43a060855d7f8891ad920c78c9b0eeae0d0c17d364d5a27d