Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c63c1e356025597…

MALICIOUS

PDF

88.5 KB Created: 2021-09-10 09:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b54e1bdfa302d932cca695de0b91b527 SHA-1: cea486df678f7c087ea3925a2474f16211344e52 SHA-256: 4c63c1e35602559726cd1f4af2e7e6a7c328a23a3dedbc23e1a8e1b254453cbe
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://tk-weld.com/images/library/File/75512459765.pdf In PDF document text
    • http://sicilyontable.it/userfiles/files/58027298567.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/tamexinasulerema.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161316027e6648---botetavi.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/24492916202.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/27932310839.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/zogemulijuzosuraw.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/dd3495f9532a4926dce1ff5fbb8bccac/zazepupalorogul.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/wuvimizile.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/31225448465.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/zamulitaximawasogediriji.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/gejobosalinulamabafam.pdfIn PDF document text
    • http://xycrusher.com/d/files/88742790305.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/d45f12e020b5390f917c873f641adea5/52471148863.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/wifuzavobibegagameje.pdfIn PDF document text
    • http://huefpdf.org/upload/file/nogupefovenarorosabeta.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/22046578381.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a5bcf16edb5396383c3b5b1588db6eb2/firisaseki.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133968e4dcf3---50017586303.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/fovixajemib.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-1/20210901120352634652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pk+movie+watch+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_off0000f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 10472 bytes
SHA-256: 98c20715984ebeb3d3c39855429d93aa601d49bb9710d18c88ebf65d765f0513
font_01_sfnt_off00010f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F19 17596 bytes
SHA-256: 1c64ab98b19919ea984010337e5513d4dd788cb484791ab8a5186b826b1d87b0
font_02_sfnt_off00013c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1