Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac951ccbfb25e816…

MALICIOUS

PDF

96.9 KB Created: 2021-09-02 13:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ff2f9a1d4f0869d81ffcdb6d2d23e15b SHA-1: be6c4991809085bbc41087c66f84baed344b1f4f SHA-256: ac951ccbfb25e81623e82ae790c85dec94700e69ebb0b1f4695e88d899e721a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. The primary purpose appears to be directing users to external resources, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://hycxchina.com/filespath/files/20210810231743.pdf In PDF document text
    • http://hotstamping.pl/files/file/23527606813.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/bf7df98397788ee63879ba27ea765d29/19012554888.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609899b254af6---93835034858.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4ff7f91a---dulenetonakezipabi.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/valinujubo.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609843f1e46d0---3276923823.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210628005300_gg314y.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/xupenalabitedupuwedo.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/tubafogi.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/ef2641d1f80239055ce8f99cb709f8df/gaxawimedokuzuzomimudi.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/83255266882.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab125619640---8947564959.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/bosinamelemazun.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/bisisipaforoxujapugokuje.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/jazidelibofigoguvamelaz.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a667c6df8---wibosiketiwekef.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/kamino.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/34427717994.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/lemujitadutatijapelo.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/57001435432.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/18798848513.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/fuxokugukulagofixejegexol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=maharashtra+times+epaper+kolhapur+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_off00010be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE0 10844 bytes
SHA-256: f4b1079099100891ea5d7b0f6009b582f1c3a666994dabb866ce0a4da9d31e18
font_01_sfnt_off000124e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E5 21276 bytes
SHA-256: d5cb24a5519191a8b050f445cbc3ca763c3fef65380cffa90cf2bb530f12ddfd
font_02_sfnt_off00015d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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