Malicious PDF — malware analysis report

Static analysis result for SHA-256 999a5cdb8b87e791…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 03:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dae3790625fd3542173bba7dc2d2ff13 SHA-1: 58180201d9bd81bef6e4a8bcf8eabfe11437f52a SHA-256: 999a5cdb8b87e79124c2ad0201c04e3c773ad1016aafe001e93feb5350bc96dd
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms or compromised CMS uploads, suggesting a phishing or malware distribution scheme. The PDF structure itself is also noted as having duplicate object bodies, which can sometimes be used for obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=latest+mha+movie PDF link annotation
    • http://nhatrangpalace.vn/app/webroot/upload/files/27624347892.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/4116502568.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614165b77dc9b---bezexapozilipekaz.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/vutigifaxilila.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161326249131d5---8851665016.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/67075345178.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/ripozadijo.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/45722079233.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/92936601896.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/boketadugur.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/51047206407.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/14869490459.pdfIn PDF document text
    • http://rjt1.org/upload/files/defopiredaxipita.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/bukorizetozafinazixivosux.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/nifulutunarajatepenafeza.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109031659135696.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/xivedufija.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/10403471231.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/96791480999.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/vugegaruxivo.pdfIn PDF document text
    • https://advik.net/userfiles/file/33524080790.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/73738359985.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613df86796aa3---94795555798.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_off0000e57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57D 17768 bytes
SHA-256: 6dd1e084aa3e5149621d097ebd21e70afe4fc36639ae1b9a2014bb9091a37a0c
font_01_sfnt_off000113d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D1 10148 bytes
SHA-256: 794e7ac93ec686cc80d6b60ea2ecb39dd5a5b4a239fb16b479c5f9d410cbfbfa
font_02_sfnt_off00012a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1