Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c97d98a8990383e…

MALICIOUS

PDF

82.0 KB Created: 2021-08-14 22:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5e872b4798bf71e0b9856a05acc72cdd SHA-1: efc6b31b7b731ac0dd4b3a1c1d7e86f006761176 SHA-256: 1c97d98a8990383ebb44a78241f471780ba8c17a53053cc0060b6fc63a73ae0f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' firing further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://thechelseaff.com/user_uploads/files/77448885076.pdf In PDF document text
    • http://menafundinfo.com/userfiles/file/kibewoxefenerurit.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/xesomajurobur.pdfIn PDF document text
    • https://vestol.bg/files/file/88176553898.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/20812420144.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/79513749347.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/2763881121.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/468ff68dd0c9e7b5eb5879a5781d9e00/xulosuworivuwobox.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0d0044064---38733667771.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/89512436439.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/46761070897.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/jufenoj.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/ospba5ot7dnught5e1v54qrt7r/vazoraz.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609218704bd93---nanipazunerapatapavikig.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xaminurudaradewasifolafo.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/4343006551.pdfIn PDF document text
    • https://paperland.bg/uploads/file/jepixedumemoroneze.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/28465885481.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160836ae33f0c7---kavelaboretesujejesono.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/s43h2128rt7qp25f050p06vjc6/rigamabujobumomuf.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efc87e30c5---31774121374.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/8298f03a3d5c41809a7c8dc11b298d80/loresazofigijanewo.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/ruzusesejejuzuvar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=a+competitive+book+of+agriculture+by+nem+raj+sunda+2020+pdf+downloadPDF 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_off0000da12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF229 11912 bytes
SHA-256: e478333bbbcd49eaecf076405768396611f946cb4796e6d22d4a873eb5e73116
font_02_sfnt_off00010e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6A 16752 bytes
SHA-256: 91c67d34d78de8022efff6c2fe940608b895ef971861246dc8953cbdae49025b

Open this report in the interactive analyzer, or submit your own file for analysis.