Malicious PDF — malware analysis report

Static analysis result for SHA-256 5827f949ec8073de…

MALICIOUS

PDF

110.5 KB Created: 2021-09-05 04:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 97efbc30d5b5c09b92931c6d32960bc8 SHA-1: 957899affe1ea87fea8ba5977398dfb4943531ba SHA-256: 5827f949ec8073de3b88e617e146f343fed061d57caf2044f76d75c2f176755b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous external URIs pointing to compromised WordPress uploads and disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://crewmak.ru/uplcv?utm_term=adorno+and+horkheimer+dialectic+of+enlightenment+pdf PDF link annotation
    • http://alexlunacoach.com/img/editor/file/rivuteripuzizol.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/53985492683.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/81080225878.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/vimoxiwetitederodozaren.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160da43185084b---buwewasuposakolifof.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/98491786470.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/49419296738.pdfIn PDF document text
    • https://uangraja.com/contents/files/riduturonanalifox.pdfIn PDF document text
    • http://markone-tools.com/upload/files/5826554324.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/51840536975.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f178099b22---betudowobobi.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/b2h9dghgfper1s2gfsj1piv5v8/44851252070.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/85633054614.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/41f27931b9d44024dffb5a4c186edc74/rinasufimamugeju.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/9a036764589c32bbab45846988a153c4/87575051355.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5ac96df18---78274019543.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/f33059291aadebad35168b7eb495b22e/puzowudasegedo.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/f85j77kc49sl3v3i1fd50aa7h1/71936307797.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/muzivurax.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bc675fb99---60242440726.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611085c3399e5---lowufolikajoto.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/17962303640.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/fotabap.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_off00014b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B01 18464 bytes
SHA-256: c64452b26bf58bf3b307355ee021596a4e67d50cbda4ca8d760f4ad590a21d73
font_01_sfnt_off00017a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A63 10972 bytes
SHA-256: 8da7477c4d1887805adb58ed13b4054892478096d25f1c6cf52fa3aa34806658
font_02_sfnt_off0001936c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1936C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.