Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9ca043fb2601a4…

MALICIOUS

PDF

85.0 KB Created: 2021-06-28 08:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b0b429fe0fecae51cf57b0bb163276f SHA-1: 4283f0df7cdf2cfd56a66b4b705547d739252173 SHA-256: 4b9ca043fb2601a4b7d1193b0cc451615e715a59d080664cf6de8a2f9bf3be39
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs are the primary indicators of compromise, suggesting the PDF's purpose is to lure users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/1p1pn09u1d5hgpvan9u57esov2/64533568668.pdf
    • http://pusancard.com/userData/board/file/raredopikowosezunenujolan.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/564d6b0cbe591e486978bc4f8dd9307b/kodawekonubaxofukuxuxat.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae94fe7147---metinoja.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cee685834d7---sigufitexekuteladad.pdf
    • http://seoulsquare.com/userfiles/file/68889406882.pdf
    • https://mclarenquartz.in/ci/userfiles/files/nasutezexegujafegeguwen.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1babb63b3---xulenuvurofe.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccf8275eb2---movavaniga.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2a79b3d08---ravigug.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/fa2b2173e802e29a33034c27f31dc8b4/66788673509.pdf
    • https://lee-trading.tw/archive/upload/files/30525938685.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/inrhrpetdntsf81ouiqg98286k/71351179323.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3488125e1---gurisojuwavapi.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/cd3b6c558646c685e46826647e0c9ec1/88196978829.pdf
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/77326328282.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ada32069c---vebavazatenakutu.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/76a3c9f83c98eef78f423d09a039c04e/pumitoxu.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/56bfb539ee8b0280bc35bac2b942ce28/warozufom.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d6ac6efb7---sobemobonofov.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ds988c93n210g8gbrjhq3rd2et/80766303212.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a221b4871a---tajulazuwoxoxopefozeg.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6985eaf25567afc38715f6594c9963ca/dojiraduk.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=fennel+and+fennel+seeds
    • 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_off0000ee09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 16792 bytes
font_01_sfnt_off0001061f.bin
c30aa371ca55d13cccc8be42c8281f245ddd80a0dabd367f19712c48c714afa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1061F 9916 bytes
font_02_sfnt_off00011c11.bin
866ba50222c43218a4772aeb794a5a241231b07d694a9d5df1393fcf823b8b7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C11 16560 bytes

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