Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1de9b11481c109…

MALICIOUS

PDF

77.6 KB Created: 2021-07-02 12:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7c99d722db4c37fd30b2300a57452a38 SHA-1: 5bc0b429c1a2f185ed89335a14c21b818021775f SHA-256: 6d1de9b11481c10992016af77eb69cbc2f54cd64f2d20824d37aeef30e1f4242
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links to external websites, many of which appear to be compromised or hosting similar PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, and the document body was unreadable, but the presence of multiple links to potentially compromised WordPress installations points to a coordinated effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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 http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16082ff3886210---revosupigo.pdf In PDF document text
    • https://associazionedynamica.it/uploads/file/80799745681.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/zaloregoponogepadumomozuk.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/1a4g10csu110747dmh4sgt45b0/wojamazujebinivigal.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160721075d677a---86244668513.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/93316075704.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814345d20c9---97620904368.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/10766178271.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/adbd7758a48fed8861ea245650785006/mesajisusabotabeva.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c90df21e79---63914116102.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fbbcce07c---vulixawimaba.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc515feb31c---vododadede.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/11637770922.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075849824dd6---17671335979.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/74492755378.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/27bcb1bab11134360a72d6b6e9a871e6/89290849688.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca5fc4e27a---viruv.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/45261293966.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/14217688546.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/67163052144.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210701052527_335268471.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1172d1d94---28211206169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=png+to+pdf+converter+free+onlinePDF link annotation
    • 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_off0000ce4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 16452 bytes
SHA-256: 5627ec78c93ed4fff6aa1520749a3da6e27a33631dabd43a5e880799011d561f
font_02_sfnt_off00011143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11143 10532 bytes
SHA-256: a1f55c9ab0ed7f08c6b030ddbe1f7a897908a7b4e6e9860b9e06cd88697e1d94