Malicious PDF — malware analysis report

Static analysis result for SHA-256 7593d218612eebff…

MALICIOUS

PDF

85.5 KB Created: 2021-07-07 11:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5d3cc4684aa6cd8888689d793965066f SHA-1: b15456cfcda29ac19875dadc256a44efd937798a SHA-256: 7593d218612eebffeb891ad4ea3aef1a66f362fcffdf0a47cf03727d22c7bfcc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=how+to+start+a+new+row+in+excel+cell PDF link annotation
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/01893d6ffa3c269caf8d178b432a4d07/voxan.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdf653247a---betojejemutewobijid.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/22845484859.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f101a3614b---ribuwosotibawufak.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/37894254699.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833bf808891---wokupime.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca00c099b58---pozaravolonasimavutemat.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///noxose.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/m6qgvgrufo7cboc06nh2h51r4v/88944937002.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b70ff0427---17669166725.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964190c7641---gewumek.pdfIn PDF document text
    • http://127.0.0.1/kardelenemlak/upload/files/71738392902.pdfPDF link annotation
    • http://baugeraeteverleih.de/benutzerdateien/suwasademewoleleresig.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/31rro7um6bdruh2ekmnfjb2j5c/3122482282.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16074465a2c190---pajixewexubajujedobilin.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/3c2e1048375aaef5d6d933217a3d872b/55743638172.pdfIn PDF document text
    • http://mousike.it/img_ins/files/wafixur.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e20d508be2---budinaluzid.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b80772236---wigadivupozolara.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/lusujerojuwigexamigulir.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/f697c043f5fdcfb850cad73590330f61/98165075267.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160940b1d2c11b---96228735454.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/6b3104c110372c975ba281dfe019c301/92218857604.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_off0000ed44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED44 16940 bytes
SHA-256: cd8063f2ec650c7648b7dcda1c535d454de644deada59752b3fe921ffe0efc4d
font_01_sfnt_off0001190f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190F 10400 bytes
SHA-256: 16ee92b636672379b27027be8efcd870e50d87a10cc3ebc7137c6dd8e3bebeea
font_02_sfnt_off000130c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1