Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9836a19cd36035…

MALICIOUS

PDF

107.1 KB Created: 2021-09-04 12:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d1ba199b5a7e8bda724128ed21ac2d90 SHA-1: 3022e9c18df8e4521467783c09aff247fdc25a4f SHA-256: 1d9836a19cd360352647a9b6f7c8dc831d6482b35b3981c09307f4f9eb2d096b
196 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=las+brujas+de+salem+historia+real+pdf PDF link annotation
    • http://ngocphuocjsc.com/public/default/ckeditor/files/14498586102.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/96339154e805114b55358570f3c728e1/65791885256.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/71633211932.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/34745469868.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/zebifomosim.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/73308000551.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/68562945636.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/00823c28c3a92fe2af687357450da503/veworipuxavuginibagukefuk.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/673fe45a67f023276fc75957a7297f94/7010109282.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/uk7qfpp6tts8q5tk9vcmg0g773/51818660706.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c603600bce8---56429525159.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/a22c4c0fcf41dce64bf150ade8e1fc52/71027953544.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/limujasalox.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/790819284611b8fae7a871.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/masofonewuxefevusabi.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/36875553aa8cd78c896b9bb7fe6a0d54/nebugijuzamiladujoz.pdfIn PDF document text
    • http://garderoba.sk/images/_file/rekerowazolawufem.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bda70b58376---tupotisovinixakaj.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/9657773951.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/jijapopug.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/bb17c2d8508c5bfac14957f6ee9a1c0e/rutemuvunugog.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_off000137fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FD 20328 bytes
SHA-256: 2eabc7fd74706054e2137b8547b40df7dded66d1765ef6f89c8cc3dbdd779a53
font_01_sfnt_off00016b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B63 10984 bytes
SHA-256: 2d1869488eb9a191953b055521a6e8005bb6f24e9e4b176af2e34b0b9a600f2d
font_02_sfnt_off000184a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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