Malicious PDF — malware analysis report

Static analysis result for SHA-256 77fa090e36791f3a…

MALICIOUS

PDF

85.5 KB Created: 2021-08-24 06:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7285ba6c4cf4a945112374944b9be72d SHA-1: 90ba12a2c4ba85f83304e09746cf981fb2414ee2 SHA-256: 77fa090e36791f3afa857eff8f09d0261a02878cd853557e4025037975ddbf8d
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 as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, directing users to numerous external URLs hosted on compromised websites and disposable domains. The primary intent appears to be phishing or distributing further malware by leveraging these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=how+to+draw+a+person+lying+down+step+by+step PDF link annotation
    • https://iword.de/userfiles/file/rofufasofimowavirufikafu.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/omol35e18t3o1olk1grckgaekb/bogexufat.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c5504b46dd7cede97e57ddeb71c530bc/46180070842.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/dudopuwal.pdfIn PDF document text
    • http://hkacca.com/userfiles/nedexorogatewatonigake.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/23380f9c31be4aedacce8907a7fe5bca/73721072208.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/rexarovefanizapi.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d97edb6bf---32340133767.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/pubulivi.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160abd35a9113a---pileselezo.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/b9a7e0e784bebe38ba14dfcce94edc64/1610612546.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/kurapezavusegizifepazalu.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611717626ad6c---jubagu.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749e911ad48---relefuketolipakegenajule.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/36786296327.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/86833072019.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/36986308084.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/40629541231.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/xepakesozunogi.pdfIn PDF document text
    • https://studiorampinelli.com/file/9498982376.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/bawijuko.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/ab82a696da9b2b1e69abe6cc52d9bc29/85846960804.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/18001807559.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/90014784959.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_off0000eb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB24 10900 bytes
SHA-256: 788dd5fde3df5fbd3410aefe524575f984f54e95c20b21a87daa78304154eed6
font_01_sfnt_off00010410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10410 16640 bytes
SHA-256: 8fe55e8a956eb740c4ca2766f75947db7bd14323a766769d191d27bacc85809c
font_02_sfnt_off00012eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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