Malicious PDF — malware analysis report

Static analysis result for SHA-256 74df48220580f884…

MALICIOUS

PDF

86.0 KB Created: 2021-06-28 13:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d2ae85330531f751e9bbbc0670c90044 SHA-1: 61be0e63ee70a4e92af3d0229345e4ac62c78e43 SHA-256: 74df48220580f884acc56bb25564e48842d34f9792d4e4260dda6f7befa52bc3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160719e0906dff---88159181351.pdf In PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/vudezose.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/vukiritomekoxo.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f13a083e6e---vuwujinefesami.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/37d54698ef9fb3a1740f0174e1ee594d/vafujazomidezobidudixo.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/a56tr6nlvlkaemk864hpc7v0fr/72093009576.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/b4sr2vaj3b0qh94o7m6mucjud5/ranurozotam.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/32f73d823898c446e4794ca37d76a026/wuluvagubifekebomuvedegaj.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/88613194018.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/6410dd157d3b3d0f91983ba43f48b35a/93791241471.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8cee2f2ac---67686208667.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/24414108231.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/koferozimodawon.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a84757b8c56---36204154703.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/sanodivazunexipunibajadup.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/57274633995.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/62668725009.pdfIn PDF document text
    • http://nineslash.com/user_file/file/regilezolamebatosuvadi.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/05910ec44f97e387752b4cd30d66df8c/74794883964.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/aad100cd9988bd91ab40cb9a0b272a6e/53626148713.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a930835da---80558137310.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075e36175ba0---setobuli.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/relaw.pdfIn PDF document text
    • https://melz-feu.ru/upload/giposenotag.pdfIn PDF document text
    • https://whitesal.com/data/images/file/8542_20210601142121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=minecraft+pe+realistic+shaders+downloadPDF 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_off0000ed86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001059d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059D 10796 bytes
SHA-256: e580449c6ae359ac2f1172939a6fe9149bd0e3a14f563ae00b25272462f1b64b
font_02_sfnt_off00011e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7C 16968 bytes
SHA-256: 54ae2177726b78cb2d5899c272f78e93e413cf4f87b1b523bbad5e249d45e687