Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3cea3c78634f372…

MALICIOUS

PDF

84.8 KB Created: 2021-08-01 22:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 897a3a3bc21587186e7192ca8b861f9b SHA-1: 204956559c66427a538763c4eb895d7f89c0b48a SHA-256: e3cea3c78634f37259a70fd688335950e3b6e06a79b2e6e9fb7299864f3de1d5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=hcg+injection+price PDF link annotation
    • http://valleypainclinic.org/userfiles/file/bebogus.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be475f35837---sobeduxiranaxudimusog.pdfIn PDF document text
    • http://fygl.net/uploads/file/210100081689.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/27540770380.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/39762847824.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/mosimekezasikebewozag.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/17244410490.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/66483091370.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160abf11eccbaf---19817669754.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/vesizilobafogalelekasar.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/9bf0e8b7a5db75be1b2eca3cc8bd1c61/95041519082.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dea9355f628---69986799099.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f0b0bb62e---7993227888.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/58a96fe088583dd31c5baf614496da37/dolipujusenabikapofop.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/fisetavakixolasaso.pdfIn PDF document text
    • http://renovator.cz/files/file/19362305565.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/womefitixow.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d99078aa46ef05165907727682a97e4b/rirupeb.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f93bd2ced6f---5811105318.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/90c64d7b2d0f6431a8d7ac62cc81a00d/xifonegezaru.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a371f1a7a57---wozozepovudopuzugazidi.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/93255732991.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210505142841104.pdfIn PDF document text
    • 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_off0000e8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E1 17452 bytes
SHA-256: 31edec433a1894cdd4399d9fb28a4813bc8cc4a418cb978282a29539c918b0a8
font_01_sfnt_off000116bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED4 10292 bytes
SHA-256: 0b754f29ea72e893877aec621e1f54e823f062e72bc32394ad9a585cc72157fe

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