Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a8c1e67d0eef53…

MALICIOUS

PDF

71.8 KB Created: 2021-06-15 18:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b94e40b1fcee0a53be472e91d497d181 SHA-1: bc6ff77d8ac5ffdcc71f812b5ef9604b5620a1d7 SHA-256: 27a8c1e67d0eef536e547aba5e24c289d66386b36640806b70bcb5101d13dd0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9998

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://cructi.ru/uplcv?utm_term=phir+hera+pheri+online+full+movie PDF link annotation
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/9f6cf77a9743d204ac690cfc8437c7d5/4506544540.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076bf8e8dc0e---94878411550.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0a1bc75217243eb269058556e9462bf0/pagiwuwalifurinatilewajef.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/neoh81ibav9ph0qbgldsi4fh1i/31854027636.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926bf188757---rigapeluzefunefefa.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081cdd68d075---nenogogobajabimom.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864c849f766---danusezeboga.pdfIn PDF document text
    • http://fitviewer.biz/files/file/fidegane.pdfIn PDF document text
    • http://mesterek.net/tmp/90007601955.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210520134649157.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/mdckb3lte9qrnig686p3p3dkb7/97127844437.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/25562304150.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a35c2ed8d3---jowaminuroze.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8e5e07d6---45572822865.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16074291ebfd6d---86396181846.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609947ca9bb90---jobidorex.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c688b8e8834---22068134469.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/86832479112.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A2 5024 bytes
SHA-256: 9ce33cb77a2ac432a102edfa78d994a4e11e7850aa8e5cd55d9b251a24c36979
font_01_sfnt_off0000e39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 10156 bytes
SHA-256: eee857f52d6873f2a5d361d715e1f5d09ed7cce4cb64f9ccc98abfe825afad15
font_02_sfnt_off0001067b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067B 2832 bytes
SHA-256: ab0b30550c16f0218ea180a56450acc25083be48fb805cb0f6f475dfa13b8319