Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e44a957834b5767…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 19:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6a4b0295a680397c6f6eb992d1d28b1a SHA-1: e8965482982a0b8c9a95acb6d9c932888e14d46e SHA-256: 5e44a957834b5767002fbb90f3a0efc8909126f51a5daa85f0850312bcaa464b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by the high ML classifier score and ClamAV detection. The presence of numerous external URIs, many pointing to compromised WordPress upload directories, suggests an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attack pattern aimed at user compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://deepankarbasu.com/FCKeditor/file/42902113513.pdf In PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/13618fca619812868a97f717b559ca75/retulaxememekisi.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/768ca43bb0beaf39eaa37b7ed3561c3d/wimedakutokenonixipakifiw.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/9c3cdaoso8vji69pk5m7eero8j/51957544728.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/wojaburofekuxasi.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f023f7f99e---turaruvawutimajo.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/purawutig.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/tamikakosakodaku.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc1a6bf049---pedisuf.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/1a8bd1cf9173100418eb603bc4d37799/63095884180.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/69982539104.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b209935c696---95826501918.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/nudaganivulitixovo.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/buzagedidekatet.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/f840eeb3a7eef3199bba9112db877861/paradegabenadomiwelal.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/80af0a63ceb95364cd76396dda021111/42299667677.pdfIn PDF document text
    • https://brakos.it/file/77611079200.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d2a274db4997197e7bf9992c9b8ccbb0/mavibezirabedutonona.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/vutifuwokanovododaf.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/86176316994.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/14014608275.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/zodewepemejovazutizixa.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/zajum.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/ledezupalafona.pdfIn PDF document text
    • http://npas.ru/pic/file/dapilejumuworatebato.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a563909b7c8---65997219326.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/678d5d21284c22d1329e2d61d9c03056/13095569143.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/0e59532a887d5e1d70733f0939173a1c/80949113483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=waiting+for+godot+pdf+summaryPDF link annotation
    • 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_off0000db8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8C 17184 bytes
SHA-256: f86f4d6deda82e6791e8361f89b5f3f95c0a651ebc1383b93e65f6e085c6bf02
font_01_sfnt_off00010835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001204c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204C 10868 bytes
SHA-256: fd349e92878e101648e3578f6f30f131872007253deff8b25b73fdbdf3e90ef7