Malicious PDF — malware analysis report

Static analysis result for SHA-256 c014240dbd6c6b72…

MALICIOUS

PDF

171.6 KB Created: 2021-07-25 03:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6c509ea0db5ac7b53d6241175a290b64 SHA-1: d2a56cfcb53a0ea7715b5543555350cfb0959ef4 SHA-256: c014240dbd6c6b72aab1e0785c0d218967335e166268c56d185a44a3663720e2
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution scheme. The presence of multiple unknown URLs and compromised CMS uploads strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://aircond.md/upload_fck/file/pugabisuvof.pdf In PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/43eab17e31ebd4e1de9bcfec63b36b22/21390116805.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d22474009f---rijijem.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/2841839313.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/66860831562.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f416f0a27bdf4b4ff8c69c5c209be24c/46128345340.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a53ce65672c---segekavat.pdfIn PDF document text
    • http://devison-matras.com/upload/file/96341000184.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e67c09cd2b---474997895.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b04ac1d88d2---fubamakemozilejujalepozum.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/dodunobujagevakufegoju.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/vomifimuvobirubizu.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/c67d9ee4f4b0302ce87b270c60a50987/bapojavufomoxofukif.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/46550746194.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/fdolko1elg3645qgscja25t7j1/64474180150.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f991a3523---tolijawajalujewamavobafi.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/37c7cbbb735d16fb161b9be1f5b2410d/76693462226.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cadc7d9d8fb---zaxanutixidopuruxuli.pdfIn PDF document text
    • http://berries85.com/clients/4/4c/4c86f126b1006e50d570d35f0f20b0f3/File/65257420756.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/38801317872.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/zovegaz.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/85076700576.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/tupuwivoweva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=8.+%C2%BFcu%C3%A1les+son+los+criterios+que+orientan+la+educaci%C3%B3n+en+m%C3%A9xicoPDF 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_off00023c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23C58 11676 bytes
SHA-256: 85fbb0b0648aa4968ea5e8734b1afc15acc53163193ee6c86946769936c157bc
font_01_sfnt_off000256f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x256F0 18372 bytes
SHA-256: 196c8349d9bbb0a6116cc772b5bc012850f70f3e2852575faa496565cbd79fd8
font_02_sfnt_off0002848d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2848D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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