Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e3ac045780cbab…

MALICIOUS

PDF

78.8 KB Created: 2021-09-07 08:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 344fc48bf21556d1de2a223dca4dae2f SHA-1: 2a2eb4f6fb5e7aa2e78f46ace09f57b9bd4ce45c SHA-256: 09e3ac045780cbab7b21fd1e2d23e201c54c3a122d853f878cf644763f6f7152
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the 'link farm' heuristics strongly suggest this PDF is used to drive traffic to malicious or compromised sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://codecs.ro/images/file/zedusanebabubo.pdf In PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/parubozewi.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/xelevenorevomovaxibiba.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/modepaviwilewagomi.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/kelom.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/tuxovosojamibezugaxoveni.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f4c197aab---livezaronifarob.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/dpnu80t7ojgi7rk6ag06ki29kl/rosuzor.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612d67ece396d---xetasaja.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0426952b4---19737881167.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e008b94e718---51981618265.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/25047997997.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/77393450716.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/xiwamitebadegivalumafe.pdfIn PDF document text
    • https://matratva.in/userfiles/file/49634082293.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/76895075092.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/21686609358.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/manefajib.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/karab.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/dekejuwarabunirumenusat.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/k0pbhr3og8h16vq8ir8d99ht6p/91736288134.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/binejadovakonumuserum.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/vijogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=employees+only+sign+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_off0000cf0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0E 18028 bytes
SHA-256: f6670721c8e111fd49c8ba6c4ebc8f020953774d1ee78770d543f6aec3c163fe
font_01_sfnt_off0000fd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD57 10576 bytes
SHA-256: 306b65918ec693f0e28ef22659a38ca83ceadb9dec8ef607815f50fc887c96e8
font_02_sfnt_off0001153b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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