Malicious PDF — malware analysis report

Static analysis result for SHA-256 448481129e45904a…

MALICIOUS

PDF

85.8 KB Created: 2021-08-25 04:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f699b19b51faa03d9698c918cb8ae71 SHA-1: 85fed282fd239ebc2febaa647540cdfd24f4f819 SHA-256: 448481129e45904a1b70ffcb8c3f39dc625730a2c1cd5f99307d6f127f914642
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, indicating a phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or further stages of an attack. No scripts were extracted, but the presence of numerous external links and the heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nomylo.ru/uplcv?utm_term=breathing+in+cold+air PDF link annotation
    • https://bodymason.com/user_uploads/files/laxodiziralemetisero.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/69313236837.pdfIn PDF document text
    • http://zjlytl.com/images/upload/File/kegulapulidu.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16083b4a4cc86e---1138489719.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b29e3e9ea1e---73948957545.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/83113657908.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16087d555e0ed5---rerobovejo.pdfIn PDF document text
    • https://x-software.cz/data/file/99606957914.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/ebe2f40b9a5e28eee2ddbdf14d70f23a/lunodoxaledexamura.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cc64ab094---7152460337.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/20653979025.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/jakiloxibil.pdfIn PDF document text
    • https://sambelteri.com/contents/files/zaweladit.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/9d02eeeeebf37012eaf53638c45816ca/tatubejuruzuxobu.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/56fe2b1ddfd749309dc7d8e0b919f8f1/dajinulutux.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/9eq7o44r05tf88ui9rpmnhtl7s/79722978467.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7b85ad0c4---savolifez.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607088aea57a1---68764568588.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/vimawowugudox.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/61377788414.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b629edd4db0---sajigosatot.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075b175b055c---xetifonumakesotezobunu.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/84736914603.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/89249691664.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/66732236725.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_off0000ec0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 10532 bytes
SHA-256: b3e8b8df71049d02b705a03976a12e77ae06d54fc8aeb6097891c13a0ebe8985
font_01_sfnt_off000103c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C2 16836 bytes
SHA-256: b98ab19b09aed6c8ca978ae904456aa73fd6c6621f0a4606af8e9688960a05df
font_02_sfnt_off00012fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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