Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a740d7a359ba71…

MALICIOUS

PDF

72.5 KB Created: 2021-05-09 15:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f62ac90e732e94a3c65049323b3cda89 SHA-1: 374f45eb497ddd9b13a1945a6bf9693c987088ed SHA-256: 66a740d7a359ba710490c57357b90c8529858cc759e745bd660a052bcd347462
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to compromised websites and disposable hosting, disguised as a free download for birthday backgrounds. These links likely serve to distribute further malware or lead to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://ketchas.ru/uplcv?utm_term=birthday+background+images+hd+1080p+free
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/4373b684959a65ef477b04485e43c930/81803460555.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/qoqre3bagmk2dhuhe33849lqp7/21029757319.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/97491d543480c600174775f5027d0a7d/76363078757.pdf
    • http://cuatro-pr.org/sites/default/files/file/60806485280.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5b79c09d1---91818677601.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078685d4277c---51488260643.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608794b81965b---dasawenizamoligurudiza.pdf
    • http://accronline.com/userfiles/file/finexevimanomosodowozoji.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160901abb03853---lenafotupelivimujubunaf.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb6bd5719---47912162572.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160830e9893e24---noxaxavovemu.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/q6m94kio82sa0am08jbl3ct3t5/6865198972.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a50b93bbb---59477325281.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160855b7313d0f---95386011998.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079435185979---66888893205.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16092fe8fb93fc---92928652792.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fedorahosted.org/lohit
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d29d.bin
0dedeeedc0ea3aaaeb7434c77ddf5e9d52798076879d1e5c63fb0f30069e78c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD29D 6160 bytes
font_01_sfnt_off0000e76d.bin
0c861013926a4477cdacda95386bc017d25e9017b7da4ebec4f43626378b6384		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 9808 bytes
font_02_sfnt_off000108d9.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108D9 4324 bytes
font_03_sfnt_off000116da.bin
2b4c8ac871655773d34a3e30026d023f7f63fd5cac3517adc6f278b1160dead8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116DA 2460 bytes

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