Malicious PDF — malware analysis report

Static analysis result for SHA-256 401ce5396acdd01b…

MALICIOUS

PDF

87.4 KB Created: 2021-09-02 17:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 412f8061f5090c953b9ff6b7a852588d SHA-1: 417b6043d7c87b3830da56379516aacf7bb0325e SHA-256: 401ce5396acdd01be89ff05d1ff55c848bf7160ff69374d9b9b91df57bd6c901
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 functions as a link farm, containing numerous URLs that point to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing attacks or to download further malicious content.

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://coretry.ru/uplcv?utm_term=o+caso+dos+denunciantes+invejosos+pdf+download PDF link annotation
    • http://dambi.pl/userfiles/file/71511772009.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21c1d54552---fixefela.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f81ba2e733---92426995546.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/xetiwowudutebosavaxovo.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32949072122.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/f086a1d6cb89f08b70a27b3f33fcbf3b/13707353774.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e34546944b5---86458609707.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/lafebinasakowofegom.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/jodegusegogisofutepibal.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210702231246_03b0zl.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b910601cbd0---59937589184.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/kametazekedopiwu.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/73357201857.pdfIn PDF document text
    • https://longhoang.vn/upload/files/26706001512.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160df8281c453a---53754348584.pdfIn PDF document text
    • http://abpaluso.com/upload/file/58744284615.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609031a2e87ac---levagijapimu.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/57645096063.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/a5e68e32e7084b7da9ac77e059f1a83e/levotezabit.pdfIn PDF document text
    • http://wernitznigg.at/files/62476017264.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/tomit.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/kuxon.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/32oe1ahpdvcu96224fbsc53j18/keliludevititodisugodener.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8ab663fb5---69765988857.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/94664082007.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_off0000eaf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001030b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030B 10920 bytes
SHA-256: d09fbc80958845a18c58a6a7652bc7a25e9032463beaf292b781ed724944a50c
font_02_sfnt_off00011c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7F 20556 bytes
SHA-256: 24dbc4c4f79d16822bbd72a29e010a4edf39923e419e3aa8bfd86482b45b473a

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