Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e43270ded3edf7c…

MALICIOUS

PDF

77.1 KB Created: 2021-09-08 07:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ca482a836c6305cff778affe769fe1a SHA-1: c7c3284cc5b2392768b1328357d5ffae25bd4ed3 SHA-256: 8e43270ded3edf7cdcf89c97bea1e3096b7e091ddc13a8e445b659ff017e4573
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/d4555798b28912ecedfa747a01f4a1ec/32977414175.pdf In PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/98951660802.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe42251b1d---kanofuxejexabexegorufixot.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/13381122786.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/e2f172aa7282e20095249c235406297d/59727225137.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/31028809565.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/velavorivavo.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb997d1f510---33004981075.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/69650192017.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/91023241132.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/takorafitut.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/717c2e78b51600d239512850f315dcd4/41904892409.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/xinikaxumedan.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/fobugibal.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/5d7f1374cf8fd94f00de95f002dcc716/49165059524.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/805f4eb181a1379cf07eedc991d126ca/fakijavavazibar.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/43caf59e2812b58d73b19c1d5e7c699a/77568397991.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b2d9aedeb---14809497495.pdfIn PDF document text
    • https://12waktu.com/contents//files/gipasaxojagap.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/55801398351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=smittybilt+xrc+9500+winch+manualPDF 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_off0000c70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70D 17840 bytes
SHA-256: abf805ff80f9125f4bb756dd55ff8b5d38024be2cf69c6b22377c750bbec9bef
font_01_sfnt_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D72 11116 bytes
SHA-256: 67f5126e9894f50977d8443722dc9bd0ecb7f158a96bbd09f72b0420dc295395

Open this report in the interactive analyzer, or submit your own file for analysis.