Malicious PDF — malware analysis report

Static analysis result for SHA-256 86da1e8a4b6bbc82…

MALICIOUS

PDF

83.2 KB Created: 2021-06-27 16:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e62d895967417900c8b5ba697360e8b SHA-1: 8f5613619c8c7b2661ed1784e18e34f4f8e88055 SHA-256: 86da1e8a4b6bbc82f7869e6c5bbcd601d26904d0656b434303097fa46328b880
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nomylo.ru/uplcv?utm_term=gonorrhea+no+discharge
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/43d3aed86990c2c1d8ad0b2e960407dd/19955687335.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/hep06egholv6jqli0p3r51bpbe/kagujerejuxad.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/6qaed1kisdfvc36gfr8nrlae9o/wazulexeduxudapafilajibil.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16088012b069ce---bekokekakizu.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160adedf22f051---27578561450.pdf
    • http://valaptop.com/ImagesVA/file/walaxanel.pdf
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/44241690464.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba48ad9e115---pominizimomumuvevig.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075222aa2e6f---79532534256.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/dcb8a5463780a81aaf4a632617795241/xawogijokuvovonemubo.pdf
    • http://gemculture.com/userfiles/file/87303969620.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c282d74aefe---49201554726.pdf
    • https://cometsecurity.in/admin/userfiles/file/12890586293.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160926fb362ae8---sutarasono.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ske4hpsb2agiardh9hprje31an/11132086040.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcb8bcbbc3---nabikimimevitigit.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c56a0f92b62---koviwafu.pdf
    • http://altaprecision.com/userfiles/file/77582050054.pdf
    • https://anmoul.com/userfiles/file/51632620941.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070a9acab207---93815337928.pdf
    • http://bensonlandscape.com/editorData/file/tazusekasupu.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1614e7260---kupakefesenoberiramem.pdf
    • https://pharma-tools.eu/galeria/file/81259445009.pdf
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/sinuzadojoropidufedumure.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e547.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE547 16792 bytes
font_01_sfnt_off0000fd59.bin
676939611ccb95ab3f27a7f290595ea1c62854b549b484ba3c2f8f6426b458e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD59 16520 bytes
font_02_sfnt_off0001282a.bin
2f9fc5a1a7ace8eb3d95eaceeacb91719d2857bdee3d518859548cc6b7fc3606
pdf-font-stream PDF embedded font (sfnt) at offset 0x1282A 10544 bytes