Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff4cf4f8408a474…

MALICIOUS

PDF

84.9 KB Created: 2021-06-26 17:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 488f4e315fbd994631f7f459a1bfffa1 SHA-1: 25cacafb5e69a5021a6b4f5ff96221aefb7bf226 SHA-256: aff4cf4f8408a474646e458dd10673ca8c84bfa294e50c1d3be34a64c1e45a97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a link-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://giftboxvietthuy.com/upload/ck/files/15898069451.pdf
    • https://francoisdaulte.com/ckfinder/userfiles/files/damosazoruko.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce93b2e538---70846320424.pdf
    • http://askort.pl/Upload/file/47259397885.pdf
    • https://willmarareachamber.com/ckfinder/userfiles/files/xajopeverelalamuv.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47a368a7b7---wobebujital.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/p9dbfs5b7ohn0k934ojhatd3qd/dovopum.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160820a322dd47---41623417074.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d780d38e3e---12104387992.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/65519dc85dbb3711fbb968eb9f1340fe/koxovozixanupanudipemefof.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/4aa4a4a03ec716301b58c6bad745e79c/7515072623.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609896299ebbb---58709599739.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4064a7a963---zijukim.pdf
    • http://thunderstar.cn/userfiles/file/20210505053802203600075.pdf
    • http://yesilderecine.com/admin/editor_resim/file/55554455833.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607d02a14aadf---meganuwepefivasaxizokot.pdf
    • http://netinflux.net/userfiles/file/31641084650.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b62dd6311e5---98439377909.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/95ce42ad5c9d8d5e56fcd3a6050a46de/xisezabubogovawimum.pdf
    • http://architects-desk.com/uploadsfile/kusikepigawibokadebixamev.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c40e9b470b8f76eb3a9968c60630d56c/vurazobazuzasuzifi.pdf
    • http://www.allatpatikapecs.hu/images/file/22765207455.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/7r392t3tslvmt9lobaoi9s1mdh/14192625961.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38ed30bd5c---84472524331.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=motion+for+reconsideration+for+bidding+sample
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaa4.bin
9d0dabbbac281c918d2b1b12d8e5e955b99510bbf0ca966668ac3e07c7dcd78d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA4 11096 bytes
font_01_sfnt_off00010414.bin
5aad7186b165ea33b4a819a8684b4be8cb63611e37bc32a5163ce58c76bc7a25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10414 16236 bytes
font_02_sfnt_off00012e14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E14 16792 bytes

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