Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16e3fd54eb91b3a…

MALICIOUS

PDF

99.7 KB Created: 2021-06-13 01:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 92a7874e93aa21fb0926606bf231ec9a SHA-1: d9f8b675d9e6410cd90ad0576fc6bd79c272239a SHA-256: d16e3fd54eb91b3a8dcbeaba4d8d4931469133d62a473e9e1180f8b7a9f4c0c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1105 Ingress Tool Transfer

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, serving as a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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.
  • 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=bengali+english+calendar+2020+pdf PDF link annotation
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/9a03f9cd8f9f35760309fa32532d7c9d/4749523012.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/6000773879.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f4e9ea5d17b5468ba7648914c15d2034/27560373666.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/zodedugeguvubunonelagab.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/b558f4e023d189b0ee0bc07d4dad6045/bamasef.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/3b29e630dd0df2b24e678d765cd0cc8f/8979571108.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b26c405208---7820702758.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/47611910992.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/kodidalomexinoziva.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/5ab77b0440e578bf5ba24e53f9aea5c1/busakenipaxolasixefun.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a845f4dea1---44244428299.pdfIn PDF document text
    • http://schokobrunnen.com/idata/mapukinezebasu.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/bovix.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b482182e1---xajovafeni.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/nfknvoto0lbtgqe7mfts22ofn4/luvinekodamepades.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090622a9a8d4---68944643883.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/b9247bdfc9c10d641844bde1b119b42a/nixamuloxajujapenepuxe.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b6e6ebeff---79326388221.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB0 5740 bytes
SHA-256: 1421fb53bb8660c080114215b58da698d07fb2a745533001b2161f9fcd91d59c
font_01_sfnt_off00013136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13136 13000 bytes
SHA-256: 0cd542f536f1263a50a388c617a1c6bebc9009ca397b6646238cad0cda5f15de
font_02_sfnt_off00015996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15996 12760 bytes
SHA-256: a912b8cdd8677625462b56772e2474bfaa1224adafc77eb7f93f5306801bdb41

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