Malicious PDF — malware analysis report

Static analysis result for SHA-256 5365885557865a5c…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 13:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4cf636579c943bf5ff519ffdd9686126 SHA-1: 8a85a7dbf9b3e22a74a8b4c161a2c7711bc3cc45 SHA-256: 5365885557865a5c0e3f4fa354af4c56c1728a7ddc2baac89eadb8fe4c44f33f
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting domains. The presence of multiple unknown reputation URLs suggests an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://hoilhpnqbthanh.com/upload/file/tukajosipigefelu.pdf In PDF document text
    • http://parcroyale.hk/userfiles/rerudoregelikir.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/c8cc5fb6a0590f89cbfceb847039ca20/51663403788.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/pirewop.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/bijuw.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/xinafenelolumalisij.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db21fe83c98---wujikuvibilegemofowosak.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/17159476968.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b584847d2ef---83663277729.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/bixuximeriposofuvad.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/mulibubemus.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160818bfbb719a---53557344592.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a56dae34---tesef.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/c7e8d2642efd132ea2ad55b57a9b3de7/81530632724.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/paxafopozotepo.pdfIn PDF document text
    • http://uci.ir/userfiles/file/42210750767.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/abfeea4e3369bfae83fe49eeba554d6c/82717764581.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfdf8ec5e8---29567957524.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/74503270672.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/ximujogukagoju.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/654bdf6bae5f84b1f7407fb37cbbaccb/15975928803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=laporan+pendahuluan+encephalitis+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_off0000e700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF12 17496 bytes
SHA-256: 03a7ead62900549821e719ed69c5ed0deaa0d34d72e43d1c31e19a3e0cf0c37e
font_02_sfnt_off00012c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5F 10776 bytes
SHA-256: 18b7b3ca252a1a20962a1da56c960bdf4a9601fe712593f2374def021a8f9e72

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