Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b330e28032b2e9…

MALICIOUS

PDF

93.0 KB Created: 2021-09-20 15:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 90d640523058f976501c3ab7a16e47ea SHA-1: 53e4ebec478d8d8057cc1e63197747b726c7a638 SHA-256: 54b330e28032b2e937a71a0a46eaddb09630b02f694e24f646d353ab13eac020
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of these URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

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 https://coretry.ru/uplcv?utm_term=the+witcher+the+sword+of+destiny+pdf PDF link annotation
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417acbdbbdd---vuwufosubob.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/84352141658.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/falurito.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/gupodenemet.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/25591597679.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/32710639477.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/xasegisaregivifoki.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/31230710328.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/op23s4ql5bilun5evr8u8gpcln/16339676283.pdfIn PDF document text
    • https://theurbanthinktank.com/files/65522490652.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/74098409512.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210908184836.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///vuguti.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sotitatemoselugifaji.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/16898918867.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/58949688712.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614692e0f12cf---32010994078.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/59623817473.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/6fe65d4fe1d6e20f74463b1bd46773b1/fefobilevijosogo.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/nixezibopa.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91510848499.pdfIn PDF document text
    • http://epicridesnepal.com/files/kerosukepope.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/xabedemonimunoxinuloro.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_off000105e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 18276 bytes
SHA-256: 3eca081ac73ce9913b4037d41a47c1250cc878366223a2a23942d20b8e818249
font_01_sfnt_off00013594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DAB 10672 bytes
SHA-256: b74796bbb4b667868bb75097ca1746f9e5bd481b2a16baed290bb0da71356021