Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce9b47b4df1659d0…

MALICIOUS

PDF

83.1 KB Created: 2021-09-05 10:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e96e9734ef0f6591fe8e8ad5ea5e81d3 SHA-1: 3346bacd799f74c4e5b567712a0cb4d36f90785e SHA-256: ce9b47b4df1659d0faee9ef20707bb1eef3261a17f8188702ff5f7aabe631727
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to lure users to malicious content. The primary attack pattern involves tricking users into clicking these links, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://rcot.org/userfiles/file/31082769156.pdf In PDF document text
    • http://rolmech-strzelno.pl/Upload/file/puleraka.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/9dil5lddqmu3f1r5ple658vud9/porizupojo.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/sotes.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/wirazizerozodipasuz.pdfIn PDF document text
    • http://orlickachata.cz/files/files/jasogizagixatezujalubu.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8dcd56c9a4---gumeza.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d431ab6fb9---josotalijavaxukofiw.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/51d1c489e96d30ec54ea9bbfdbb83a3f/fajoximigonikopoxategoma.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/xuwexefogewodo.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/28677206747.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d283af6a8---rogisolufoput.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/bexilokazaduwomapam.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cvonismklje6at1b33q4bumv04/26366099576.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/farumenuzaruxuni.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/296418275.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/66225569320.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/88385470868.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/xetadevesak.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/gatazarasepufaputoropunog.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/42465624458.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/podaraxomukeg.pdfIn PDF document text
    • https://kawanmto.net/contents//files/vinipebofirazomopusali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=circuit+training+exercises+without+equipment+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_off0000df27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF27 17616 bytes
SHA-256: c7994d11f45bf8d1e13cd2d0dc283b802df76c949e240e0b1b00c440a7c521b8
font_01_sfnt_off00010c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C03 11488 bytes
SHA-256: d8af57ccf75cd3fb0f4b72b794ed63e1326d810e185353f619c0c4be400da4ad
font_02_sfnt_off0001269b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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