Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cca734969ff81e5…

MALICIOUS

PDF

70.0 KB Created: 2021-09-16 15:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bcb4ae1dcd2daa89127aca600c1dafec SHA-1: 799d70e21b15cf5a8e49d1bd44f3022dd9719625 SHA-256: 9cca734969ff81e579c93235ea651fa581a5f83d699a470b1cb33f0d8b8ac5bd
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a link farm or phishing lure. The PDF structure itself appears to be a link farm, with many URLs hosted on disposable or compromised domains, likely intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://architettipassarinmarzotto.com/userfiles/files/67661105166.pdf In PDF document text
    • https://sanipacific.com/attachment/file/gumonil.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/lovasewigefet.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/xefeji.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff0eb4d844---bisuwaronasavelowinepod.pdfIn PDF document text
    • http://www.polni.si/Images/files/lejinadejisid.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140aa059bb06---bisudelog.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/nokopapunopaletibum.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396b445832d---torifa.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/69404779781.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/sawepobirixerad.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/xoxigifi.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9c7879cc---kojigen.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/4947005047.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/sulidufen.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/wukisilalojen.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/e7c1a0a06b9efea8a0bd4a11d1d621be/wabaguvafivixeximeta.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/181c492b9245a9aac9dfe19f243856b3/29992551522.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/55260005726.pdfIn PDF document text
    • https://ags-car.com/upload/files/18563246691.pdfIn PDF document text
    • http://proart.by/media/file/29858820079.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/85550364439.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1419b5d52eda80beb6fca5fc88a5f01e/zetoxifuzokofatipawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+block+a+particular+app+in+play+storePDF 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_off0000b394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB394 15028 bytes
SHA-256: 1b609f753e3f3a39d70675eb3fb5d321dcdc8e08efade8c23f61538aa68b121c
font_01_sfnt_off0000d8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FB 10888 bytes
SHA-256: c0a2ca8e698e86b3c6dfe09740eeb641de55fcf79e314d7aded57bb2dcaa47ef
font_02_sfnt_off0000f22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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