Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e451ffea4e96c32…

MALICIOUS

PDF

74.2 KB Created: 2021-09-04 10:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 17819ced362397b608b14573f161f40b SHA-1: 749b1936f18dcda289e796c713e61a3b149218b0 SHA-256: 9e451ffea4e96c323fd5729f1cad4ff9d6fbca035ea50d44ac728a7c00a21de5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs indicate it is likely used in a phishing campaign or to distribute further malware, potentially via JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=cosmopolite+1+pdf+vk PDF link annotation
    • http://kristenpell.com/userfiles/files/21081243408.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096263940461---pefeguvibiwofuderune.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0ff28b53890c1ddb14076280282f54c2/97691167543.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/da361555bd04a06b8176e80130b11778/tevage.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/gutanatarejutir.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16074441263dfd---88309256079.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/73fc3046099b26a51496f8fbdfeb8ae7/41179613642.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/40231249503.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/nelajeretarevo.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/4vqjpjqf721fi8sjndgkd90u43/pojidokafikafegav.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609858e72aa34---17752537458.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1610134cc888c7---jiwopivosam.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/tikapemizejavogenik.pdfIn PDF document text
    • https://thaihoanghung.com/upload/files/79314360575.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/dqf4jgpqkh9kgp81nqd7gcvi4m/78707378756.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/f14def6c4b3696ffb9622cb461470ef0/gisadani.pdfIn PDF document text
    • http://walker-doss.com/clients/4/45/450b4a4af5ff3f13851793278d9c7ef8/File/43693396687.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/pevugesumapojozabusajene.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210606090753131.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/38906335754.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/20322865430.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/32876537636.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a702ac2fb---55845690250.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/85472012404.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2c54ce597---88814827646.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_off0000bd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7C 10536 bytes
SHA-256: 6ba8f2a4f24ab0ddaa88ed1f103654b5e890511795a283848793e6a2cd6479a2
font_01_sfnt_off0000d596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD596 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 17976 bytes
SHA-256: 02d0af216e9e7bf71fe3e23da9d0aafc3a1bf344e1983f42ebf58c1ac2a61020

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