Malicious PDF — malware analysis report

Static analysis result for SHA-256 9171dd84e41df249…

MALICIOUS

PDF

74.6 KB Created: 2021-06-07 13:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 980018f5e38230f7d3c3b8d171903596 SHA-1: 113d4ce99123cad4484826f1b097d7ed3f74d4c4 SHA-256: 9171dd84e41df2498b8b1db97c4e7730af0f51a78a84c205e52d6cce83541a92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a specific book title, likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://nomylo.ru/uplcv?utm_term=metodologia+dela+investigacion+sampieri+2018+pdf PDF link annotation
    • https://tomas-music.com/contents//files/jevapudiw.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/jagabalesagepininid.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/hv4aakeqbo79oelbnv324lrla5/rupameborenesakitokub.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/pn01c39a4nt4eod8eut69f0ul6/tewinijego.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/pipumaralemusaj.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160724e1b65780---xerumotixexudofabar.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/maxukagixabujabu.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/d8de49dd6ec3a5225f836847c12f0d68/tebokegikuwovofevumuz.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/38664988208.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a06411c2be---ligofi.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a4f24ff4f---sukat.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/laragomeja.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/miketixedadi.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fabe0e29f---63496499885.pdfIn PDF document text
    • http://sun-tes.ru/files/file/fizigariwavikow.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/79768400802.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c60714c6f2---14256852467.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6B 6060 bytes
SHA-256: 399e0dd3d85c6d4587aab027c25e6ace36bb82a56f976d272c3d8c145e864ba4
font_01_sfnt_off0000f311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 12744 bytes
SHA-256: 88afc25e8cc20c8e234b644fa5c609bcdc3cd0dfa70ca9c195d7c16257e20530