Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea11fbb8bf706b1…

MALICIOUS

PDF

111.3 KB Created: 2021-06-28 03:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8f3c4224f682d93c2775f508458d64b0 SHA-1: c2a2cfece401bd408f2ea295808809b2ec304bb0 SHA-256: 0ea11fbb8bf706b1b13589ceb4be229b1dea95a4ac8f9b0f8dcd8e4fa13110f5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other potentially malicious sites. These links are likely intended to lure users into downloading further malware or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7utr8cda5qqf1gib99e1q6csb/jukikudunus.pdf In PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b979ae15ae9---94909996564.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/94865211011.pdfIn PDF document text
    • http://artospace.com/pics/file/bumelegurebazixudej.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091ae189dc84---36982243542.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/64986730227.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608785bfec959---neriv.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/jofifitenedolulamob.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/rudokadomidorufurusisagat.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/83512605126.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/fajarekogirujikumuradit.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/551969926c7e02c5f4e1a7c7000abdd7/fukonigibepowiwelu.pdfIn PDF document text
    • http://atya.eu/files/file/madaxovomukisopozu.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c5099f8f1---rureximimagexojis.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3ec4ea204---69799320286.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/jabuvebevuvirugobugofedeg.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1abf1de472033472fd72f488d6cf160e/ruserematofurudij.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6550de9f---38805084389.pdfIn PDF document text
    • http://aimic.com/userfiles/file/69867431268.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aebdb1a7545---dojajifanatavumivevezosoz.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/92ffb8fb72e165edf0e117cfa748267c/19264177539.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/v2d4m2qbqeouc4v2241cq4voph/petunesigalenelaboder.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/0kgm5k3m08p2eljo76n19dkcgq/28854108301.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/kqhvp2dmv8mk6p70kbs03da6e4/radatulumetizozexez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=perfume+the+story+of+a+murderer+storyPDF 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_off00014e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E7F 19184 bytes
SHA-256: 9b8f497f7fac98f44ec6bd952a0f454baf3f678613c5362210527df1c2e12b56
font_01_sfnt_off00017f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19759 10592 bytes
SHA-256: 4f225f9eeb3ac95216f411bad9212c8de88386e57eeaa51f3d64c286646190fa