Malicious PDF — malware analysis report

Static analysis result for SHA-256 827d35b77cbd42cc…

MALICIOUS

PDF

84.6 KB Created: 2021-09-15 23:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 95ab419c9e401b2e3b89daa2a7949a7c SHA-1: 1f5b5ed56ae1ab2c81a075a418e8c7e2dda0cd2a SHA-256: 827d35b77cbd42ccdf742070c50c88ffe69b61bda4b54ff7d7abaae28d7e3cec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure users to potentially harmful sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=villa+papyri+herculaneum PDF link annotation
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ec99e65100ca52fc47f88e374d299f13/94973392371.pdfIn PDF document text
    • http://denge.aero/upload/files/64880997698.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/29324284256.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/53415857104.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/532690ecd68d2f2a66cb35b0f09e44a4/92012596364.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pizofavinejowejoruremu.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16132ae0784d79---97498800914.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/muvep.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/97228843002.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/68731002612.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/nuzikoroxi.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/kekenakujebe.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b67e114bc1---40835501028.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///jotalorot.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/47084859055.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/7085972776.pdfIn PDF document text
    • https://service-panev.com/userfiles/gotifavi.pdfIn PDF document text
    • http://mopron.ru/upload/files/83763212899.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/polapozoragimoguv.pdfIn PDF document text
    • https://petikdaun.com/contents/files/fadaxevagovunerutozit.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/tunodedewowa.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/39947781374.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/43010246762.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021091422237_1007007433.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_off0000e604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 10436 bytes
SHA-256: f8ca1cb4e38e605ced0738fa5319cebf11aa1cb055ad81219efb0e8a4389ce51
font_02_sfnt_off00011582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11582 18356 bytes
SHA-256: 4d6b620a4548c210afc6d41470eb39ba0b78b7b307ba780e492da253d75defd0

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