Malicious PDF — malware analysis report

Static analysis result for SHA-256 900c0fff0fd17db0…

MALICIOUS

PDF

92.5 KB Created: 2021-08-31 00:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 679b456be7710bc06ee46dd8ec077f30 SHA-1: cbcd91886e7d28feeb977780061307923dadd2ee SHA-256: 900c0fff0fd17db0671eecf7bfbe435cb451cfd492adb4967771b24f00d7c5f6
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c877ad20925---99469107764.pdf In PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/c751ca08969d07c2e963291213b278a4/xobelipi.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/95eefa82cac70d755830ea364c15315c/40904484980.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/93a777d910e570fcbf4c83b3828892a4/ginejavikewol.pdfIn PDF document text
    • https://lymfologi.se/anvandarbilder/221/files/91077165726.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/wuvelodoterefebunu.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/3e572e4e2ce255d63690ed5602ad49d1/65559025958.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/39409740460.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/mixaxuxu.pdfIn PDF document text
    • http://xibuhuanyu.com/filespath/files/20210810050836.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/2590566137.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/gagexanekabemerutukix.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/tabonolivuze.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/22006424430.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/c25a9ecdcfcb06bbcf5a48ba45604be5/94199048792.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6e9f83b8c---bobepapez.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c6358528c---gibipefu.pdfIn PDF document text
    • http://esteel.my/userfiles/file/63589805776.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/55760603974.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/69869967807.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/83231484034.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/dujivasiwoxakoguvugek.pdfIn PDF document text
    • http://radfordhsclassof1970.com/clients/878146/File/goteninejubuputafevaz.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/ramujivedafesero.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/f3c239e5a0512959b1601b9d1c0f8425/golezinalazir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=if+i+had+one+wish+i+would+be+your+manPDF 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_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11887 18976 bytes
SHA-256: 3dce4ea6faf96a54fcf0cc0b0542829a2b8dee4f9e654dc9969e94f3de4c0289
font_02_sfnt_off00014a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A07 10912 bytes
SHA-256: 2627d140a417b9935ad461be72c664dbab02033ef99f292210f928b8511e01d2