Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a621799411f85e…

MALICIOUS

PDF

75.2 KB Created: 2021-09-06 09:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aa5f95385b409aeb451b7febfd53d50f SHA-1: d5963b6a01afa81a33e72385b91815279ff30c51 SHA-256: d0a621799411f85e9de325a8df89cae7f6f55000aac5b4a84bc2e01700cb4b86
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that form a link farm, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a link farm on compromised CMS uploads suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161007ac0ac09c---jabanatusonawi.pdf In PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48f6a81b31---wumujelubufitupewamewu.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/99522399423.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/mawixema.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/78704719969.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/if55t55l7njoogqpr7q78ap3jt/maduvu.pdfIn PDF document text
    • http://gerocuki.hu/user/file/todufevaselagodexe.pdfIn PDF document text
    • https://lazerom.pro/media/file/xapovematu.pdfIn PDF document text
    • http://alvitraders.com/files/denasawitulasujekulu.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/2433056280.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/62191849121.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/a5b9c9f37082bfb6515ae2e9b91bd8ec/jovogubujikifikitawipava.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/40195235234.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c955760918---ruxikegobejimezawij.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/gujadija.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/mubomaxikibiri.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/161201704ac3f9---zutizoduwosutewaxoxa.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/74692897073.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1623701250.pdfIn PDF document text
    • http://minerva-collection.net/files/files/sapexoxajedotudikujejofu.pdfIn PDF document text
    • http://huimao.com/upload/janogizunesipejali.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/44d9511f8bc26c603f907ec8063c7765/25521625324.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/28263410605.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/97804678301.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/73652979444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=rosemary%27s+baby+script+pdfPDF 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_off0000c154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC154 17040 bytes
SHA-256: f9fd49ac254490cfd9c828407a2f49e4e84894635f14947d24e6b43bff343b6f
font_01_sfnt_off0000ed32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10549 10964 bytes
SHA-256: eec73ce96df1eb9cb5ef2d8616095cea308c3d55ee1141a411e9c49ee8ddbd03

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