Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0a42878b82daa1…

MALICIOUS

PDF

124.3 KB Created: 2021-07-05 01:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2bdadcd0f42ee52bcd088b3055f7e7c2 SHA-1: 39810ae0e7b7539827ebcba3e4d2a64b6fc8bbbc SHA-256: ca0a42878b82daa1569a65121aa8a3292804f7c4486673f746bd31e83759cb8c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, contribute to the overall pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/5fqdfja59slgu297ksnj6bh2j6/ximidugopanofure.pdf In PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d1d519052---mafotumojowusavaxadujo.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6cbba4514---tezunalorevaruxewudemib.pdfIn PDF document text
    • https://magerp.org/upload/files/82809346431.pdfIn PDF document text
    • https://birotex.rs/images/files/deneb.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/sugusugazifenudi.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16078545f6639d---85218149262.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/51525505022.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/49191839381.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/pijamexadama.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/24573351208.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae60a08e8a---gudajumedatanoja.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079436f062a5---divotakagorokirenov.pdfIn PDF document text
    • http://imi.vc/upload/files/tagewugukogido.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/61261796758.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/a4d7fab8bec1d2fb6c483bc7e2f4f24e/53448461649.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/notanamatokesaluji.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/8ps3vpgjbhhamp6e1hug4vkn5k/53162814482.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb759a02f93---99365231629.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/vobozirefudalajogitin.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebf63ad8a2---wopup.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/880ad87691d889096da6ce85b4c9f0c2/1911017526.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/8a1d45ae5e22395dcccb8c3a7129c549/22489065694.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079ddec4742a---gejar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=application+of+philosophy+of+education+in+the+classroomPDF 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_off00018042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18042 18272 bytes
SHA-256: 2048404f0b976b2981b430346a2c5ebb3ca8d76ded64d49dd25a5d6a6f41d543
font_01_sfnt_off0001b000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C817 11080 bytes
SHA-256: 6aad4523904420dfe6d5efc6821330811cd38e7110a0bb0167c300651e491f16