Malicious PDF — malware analysis report

Static analysis result for SHA-256 79546ba7e6aef5be…

MALICIOUS

PDF

133.1 KB Created: 2021-09-07 19:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 176067c54143f5e2c4412d44abac1893 SHA-1: b8f3ad512195b6ac8798850f1798e92d5046e65b SHA-256: 79546ba7e6aef5becff0b6458ff950ca020f7045840a9dbcafd044c6725ff739
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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.
  • 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://ajtoablakcentrum.com/_user/file/fipawudokin.pdf In PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b457538d5cc---runuwojunababazi.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/65575150374.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/furafisug.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/3727118634.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/7ec29089ac4c26ea483c84f81af657c8/5420183507.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/76359525023.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/futikowunim.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/224778d382d6cc2e43f28e2f23593888/64309190104.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/g3ugjsass8t95vk7hlrsgthla8/duvasevemek.pdfIn PDF document text
    • http://phs60sand70sdecadesreunion.com/clients/880504/File/32554701881.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b674e98b49ffd50f57458a358e159f12/jizogatozosurifarixuze.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/2993974699.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/28589cfqu81a8q4mjapj4njo1a/tixeniluwiv.pdfIn PDF document text
    • http://ropesadventure.com/d/files/zobatuxakivovikel.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d53b86b11b1---17810042191.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/asl6or5mu07k5njcdd5i0qjg8v/dunivomutonotibo.pdfIn PDF document text
    • https://aedwea.com/upload/foto/nexotuzuwigu.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-1/20210601173032201408.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889d32e414c---28583930682.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16100dd6414edd---97384711371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=patent+rights+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2E4 10612 bytes
SHA-256: 75dc60c49de36993107deb010be9f93ee881e769d19c6e1b22dce6501586df4f
font_01_sfnt_off0001badb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BADB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2ED 19856 bytes
SHA-256: dbdb748acfcf7a457e81b616979acd9463076cd6e954668c3d4606660209c61e

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