Malicious PDF — malware analysis report

Static analysis result for SHA-256 624ff3ac8a82d5d5…

MALICIOUS

PDF

78.8 KB Created: 2021-09-02 07:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4d53a2740935fb20369efa704b1c5c70 SHA-1: 50656f67cc7413d1d47a1e7ae0b0da0a6af24c08 SHA-256: 624ff3ac8a82d5d5ef6cbcf008685aa0cdf3995f63e7bc8d7d7b6f8245268a3a
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm pointing to compromised WordPress uploads and disposable hosting, indicating a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URLs suggest the primary attack pattern is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://huntic.ru/uplcv?utm_term=html+listbox+with+checkbox PDF link annotation
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20217152359417335.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161125e35127dc---fogaruxukumosejedifimit.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/muvegojirewibixifijo.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/r1s93vkkgionb7mv8fgi3d11el/27112757091.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/792r3i46qa4o3407bkoqg39dmv/87672358477.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/37d72c2a73f5ef8829b856b11da24d05/digaliwipirozovojubatu.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/61596449886.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/24177429723.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/62569969084.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/xaturetakabefa.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/sudepegebafamukofimame.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/kurapujurebozawofovas.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/towotaz.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1afa324bb2---99047895855.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/sizebagefobe.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/wibitusevobisumulufef.pdfIn PDF document text
    • http://novichiha.ru/pic/file/gupixavasofufikamabavuvek.pdfIn PDF document text
    • http://pedraferro.com/files/files/zuburujuragunebepoxopa.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/15669614991.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/512t4lnci1vmn1ocosq7acgvcp/36775238085.pdfIn PDF document text
    • http://rts-3.ru/upload/files/9976675535.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/516169122203cf9d99b1fc1bef895829/zeletimetogevosatami.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/b3b96c79081c789f12396d8f405f253d/bujewafekeza.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/92341159623.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16100f83481d45---rewarovasuderip.pdfIn PDF document text
    • http://dakov.hu/_user/file/kujakurexamevila.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_off0000d08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08E 17196 bytes
SHA-256: c71f65fb1410f5a09185017adeddbd3216c13e79b51e4013e8d9af5c9c51be5e
font_01_sfnt_off0000fd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11528 10540 bytes
SHA-256: 892f215b715f8cce89ddc289dbc1209a4f24a517945368949520a3e4ce5d98ce

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