Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c43b899730f89b6…

MALICIOUS

PDF

78.8 KB Created: 2021-09-03 09:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 278569e67d3e1b2c42eb060ca03a8398 SHA-1: 6c3140da9719367abd767a7d0c3e663cc619315b SHA-256: 8c43b899730f89b64118572d30a4f8f7ec453e22d7e4ef5b665abf537f261079
164 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://al-farh-iq.com/upload/userfiles/file/90798300561.pdf In PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160bc53fb57eb5---66292383211.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd3a8e49a6---tafoja.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/dabulukovisugaxakudatomav.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f079b19aa2b---nefixoxoxaluvekoje.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d7e9e17db944707cf931f084c6e0782/latoxefugupuvoliwazixolot.pdfIn PDF document text
    • https://vieclamkinhdoanh247.com/upload/files/88338618889.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/33371280446.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/gafupumev.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/sogoxolatinaw.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16104ec7e2fb86---juwoberado.pdfIn PDF document text
    • http://nincity.de/inline/file/2342430774.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/beluvegavipokinaj.pdfIn PDF document text
    • https://mszukam.pl/dat//file/41146656791.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/83330359958.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/jnn39f95ns66d57tceiulf9ce0/razonubumude.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/bojofuzogotuvugevobegedib.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/4617107418.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/zotomituluwovalivigubeg.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/6623538900.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/r1uu7gphk82h34e7nblm00lnqa/migomezefavujep.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/11084188864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=manual+camera+app+downloadPDF 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_off0000d1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C5 10496 bytes
SHA-256: 6118e046276317a6fb450595a50e28cd62839f3277c0e907bc5deafb7a7c2975
font_01_sfnt_off0000e99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 17216 bytes
SHA-256: 02ed069cb847bc6ad481967ee0b8026f8829d1341c6d2d33002606010c097e1d
font_02_sfnt_off00011611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1