Malicious PDF — malware analysis report

Static analysis result for SHA-256 bebc500be5b8c211…

MALICIOUS

PDF

71.3 KB Created: 2021-09-24 12:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b448f631f6db90a473bcff973ffeabb9 SHA-1: d29f60144624f78d3c61337a26900cb39871e725 SHA-256: bebc500be5b8c21159925fb0cdd1476ceecacdce8ced4176c8eb3ec0ef382e69
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 uploads and disposable hosting, suggesting it's used to distribute malicious content or phish users. The embedded URLs, while numerous, do not appear to contain executable content directly, but rather serve as redirects to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://2015.letnifestiwal.pl/ckfinder/userfiles/files/41069028806.pdf In PDF document text
    • https://dentalrud.com/userfiles/file/87604315824.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/7855521293.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/pejotasazawapelorevabupi.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613d61cd71090---27285047801.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/navazozifodukenof.pdfIn PDF document text
    • https://cian.hr/userfiles/file/52818389842.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/35753003896.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/61435203088.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/c669e5b2e4628f41c9b2566e29e4fd2d/34313572558.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613429210ddab---nulonimiginejapos.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161442de5aeea5---49949994938.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/fafalerujevekikep.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/36141508747.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f2d65ec580f2cc0e8ca92184abbb0847/xowiralop.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137be1fd06a2---84015375372.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/80782815675.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421d4273254---zufidubama.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5014036c2---nerekuteresoxusedi.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/12845258164.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/minobefadexenotowun.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/gidadub.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/15953381832.pdfIn PDF document text
    • http://ewtch.com/upload/files/31315542797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=high+five+emoji+androidPDF link annotation
    • https://lapdonline.org/file/fifawazapidipavosiwa.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_off0000b8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E3 10676 bytes
SHA-256: 1b2ff18e05db58e2692959caec024bdabfc15c67586a079363f4aae35109969b
font_02_sfnt_off0000e8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D5 15396 bytes
SHA-256: ab3206dc722cedb0febafe3f934e663839ea846e4550d2cc8cf5b48afe153c36