Malicious PDF — malware analysis report

Static analysis result for SHA-256 6997b44872e8e7cd…

MALICIOUS

PDF

90.8 KB Created: 2021-09-05 16:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7699380aee4dc5937945e96bc5708266 SHA-1: b8ccae80f3c72803675be842d7a685b13fc0282d SHA-256: 6997b44872e8e7cdf98189c22af5db0a70940fbe07f2b5d06aa1098eeed01de3
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links, many pointing to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or download of further malicious content, while the link farm serves to obscure the ultimate destination and potentially improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16084391c8ab0c---26786369139.pdf In PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/12b2b3280a28c11b8294092b2acfec98/muduwaxasar.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/teminejitadejokenema.pdfIn PDF document text
    • https://questyme.com/userfiles/file/56269910830.pdfIn PDF document text
    • http://azizolace.cz/images/file/tewegawufut.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/buvuxezig.pdfIn PDF document text
    • http://darstin.com/userfiles/files/dofelikip.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e4325839c---59439032989.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/27280118016.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608703a88c0cd---refudamevifano.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/28497778661.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/7168bfa525c0894bb422521f4c2454fb/2081460262.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/41633443225.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c017248b3---gozebim.pdfIn PDF document text
    • http://recrute.fr/files/files/96251740170.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210816121136.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ckm0omrkht61aq0a3qul5ho0cb/53110530775.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/56218618944.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609038c1e637e---fokawafafamikusaxesos.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/dorogorawamenufofew.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/3pkll98koptdghp9dul8hvfdv6/56846590612.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090ab0e0b214---dilirela.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/lumotodofakonujofenanura.pdfIn PDF document text
    • https://daiichigroup.net/uploads/news_file/65770859847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=steno+book+pdf+downloadPDF 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_off0000dbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF7 22936 bytes
SHA-256: f85fc2aac6079025a8693084ad47fd59a0208c2ea5dad101f885f701232738d2
font_01_sfnt_off00011764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7B 10524 bytes
SHA-256: 03623534e3bbecb2595a785f8ae57b078f0013641c2037ffba813e884621f428
font_03_sfnt_off00014775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14775 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f

Open this report in the interactive analyzer, or submit your own file for analysis.