Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d767a7c971f1db…

MALICIOUS

PDF

105.7 KB Created: 2021-06-29 08:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9ad5eea04a658dbe52605374d095580f SHA-1: 15d4d86e4dc510f0ab07a39c3f5a1d52a8deefc8 SHA-256: 56d767a7c971f1dbee3609125e5ded64b5d7a68ee35ce6c08ead15cafdc3cb71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. The presence of a link farm suggests an attempt to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://pistant.ru/uplcv?utm_term=rn+work+from+home+ohio PDF link annotation
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080aa74b5f75---xixafese.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3226bd7e4---jujiruwaroguw.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/89695139202.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///19399285699.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160892395a2a68---kuzejilefowip.pdfIn PDF document text
    • https://efnnma.org/files/file/21472475415.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/pebakusibivuxexuzolez.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/26035493002.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/5ntl45u502c9roc2f1qq8p4n53/bitasukajibopege.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/4387774748.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/jebegatajaxexonezok.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/4gtr1lnenieo7igbethihgb3md/75477224830.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/53964087280.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/b325f45b36084bd8879cc63ff874cc3b/63587008810.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/6e556nid5i849o07ggtspdoa96/91004528501.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/c9a4e66ac47fae25869f03684b72fd1a/wojesemivuwe.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e4f577564---92267103839.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/sosazelukexuvujuwo.pdfIn PDF document text
    • http://imi.vc/upload/files/kuribalojuk.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/gefabunovexunenojoza.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/dulojipiperamubuwegidopew.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094bc125b7b8---62211915731.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/duxemeredewemepexelupeget.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16072061c3f412---65622392854.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_off00013a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A85 10228 bytes
SHA-256: 0151e8c708e58f44091000bbf25d4de07c4e364ab81dc11501b4d79d377e128c
font_01_sfnt_off00015147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15147 18788 bytes
SHA-256: 72b0bdc41750a9c970ae3df9e3bd4e6e961b4666f5ee305de75400b8e8653920
font_02_sfnt_off00018192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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