Malicious PDF — malware analysis report

Static analysis result for SHA-256 523a4feaa20f20c2…

MALICIOUS

PDF

102.0 KB Created: 2021-07-07 00:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e1e9ad232f2c47193cd69cadcbaf4eb9 SHA-1: 9a18fb3840a8ca1561caa508dc6d86297815aafa SHA-256: 523a4feaa20f20c21fbb86dae15c2f506becdf01c169edd12b565fa7f383eb5f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly indicates the document's purpose is to trick users into paying fees for non-existent prizes or parcels. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a phishing or advance-fee scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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 https://krisoc.ru/uplcv?utm_term=reasons+for+constipation+in+adults PDF link annotation
    • http://fygl.net/uploads/file/091902394368.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/4rk5smqttmtulkesg10cpvkgfn/26034357422.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/e2uqffpnfji06b4ed4uiinj5q7/nejuxijalamupo.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160731f01069f4---4168581286.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b3636e6ec---34594494838.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c50a86cbd1b---36807269056.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/164id21aop4u3a16htibcgks7u/22627416398.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a050ec0a645---gobugefiduret.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/8172547466094213014203.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/rigifisakutakodubefuxam.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/robazusujidutesaponuduxe.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7fe6cf046---36213876980.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/12431522722.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/6d7089ea09d2a38ad363d628767ec2ca/mipixi.pdfIn PDF document text
    • https://hse.tw/upload/file/luramotepagumawevawu.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/56800803751.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f3750410d---sikupekawis.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cbff30a1c15---dadikotajesuburujoxulol.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210628051138.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094a7ca1f738---52463744226.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/kirozometodonemobisar.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d15189157764eb1727ffa26220b42215/34108426822.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/43631034716.pdfIn PDF document text
    • 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_off00012bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB5 10756 bytes
SHA-256: d2d875c654815e1ba5312ffcf4ecc4327e072aafc7d93078eab1e0c90aaf9644
font_01_sfnt_off0001448e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448E 17524 bytes
SHA-256: 057898a1b13b4f2822f484b082fdab738402033e32aaa9fbe0570a8d26c01e1c
font_02_sfnt_off0001729c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1729C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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