Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e58c499f94ec15b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-23 09:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b44e7bf1cde8953bae86784be67a65cd SHA-1: c2cf9cd608bfa42322794ac642df669e3051561f SHA-256: 8e58c499f94ec15b531d35abad6e0700016f69b24c507900c9dfe6974b6ba065
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 links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://jingkangchem.com/upload/files/66286036997.pdf In PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161300e7573ecc---82124045927.pdfIn PDF document text
    • https://promise-land.com/upload/file/depagoxetigogowovupuw.pdfIn PDF document text
    • https://unosms.us/userfiles/file/tajajabuse.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/nuvukuwiwigomedevazul.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614821827abd2---fifozubuxexosatirofuledox.pdfIn PDF document text
    • http://xlith.com/userfiles/files/metawemibopufuvifiruf.pdfIn PDF document text
    • http://atoutslegion.com/userfiles/file/72487038213.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/jomekumuxilurubuwutu.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/7962224126.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/bijewovoselixuvanegi.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/68088511127.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614036154f5c2---27466600670.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/liwalogojikejexirilu.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/zisetix.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/40134215465.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc870fd68---wugenalevageboki.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/tebimipudatuvosol.pdfIn PDF document text
    • http://www.bash.cl/media/file/lixukofej.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/48029596279.pdfIn PDF document text
    • https://suksesunited.com/contents/files/2941127315.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/jozotisivaf.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210919093749176185.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/kobol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=top+10+android+emulatorsPDF 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_off0000e2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC4 16328 bytes
SHA-256: 9b0ff6d14905e0cd2838a02116c790d3232cf08a9be18f615cea6664593adc7b
font_02_sfnt_off000124ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124ED 10792 bytes
SHA-256: 7d09a3bd912f689eebd17ebc311ceb89fa3adb39eb5e57db274d482e9a38d717

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