Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eb3976223b232a7…

MALICIOUS

PDF

88.3 KB Created: 2021-08-08 17:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 052952ad53b4f414ea93eb0b41272c81 SHA-1: 08f32428dad604c3fc3dcb94dc3fefb9a5309d6a SHA-256: 0eb3976223b232a721590e732697fa1c3262a741cddcd6adf2371d5b0fe4633d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://deltastal.ru/userfiles/file/detokugigulivanamidiwojow.pdf In PDF document text
    • http://thamcohoaian.com/webroot/img/files/11549209980.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/26349225435.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/accee4dd41b858b3524c42cb838f99db/detawakur.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/18228jpofrhjfgmdna8m0t9vdb/29920970155.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/dijalezogukemaze.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608ced873d73e---65255845059.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/amd71gn0e92p7rmlamnkitd6fq/vukogiz.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/5149209584.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/kejukuketekevolusadiv.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978b4a55c27---47918131730.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/fufexu.pdfIn PDF document text
    • https://ka-base.no/images_students/files/lafiwosizepexisofaxe.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/4bc00543551dc751a6a39300d4c10315/17652553795.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/42699652136.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/309101818.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68a5fa61cc---74029977610.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b01c1c01882---24816630936.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3e6d1e107---dezux.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/komemebigimi.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/426abd4ac95f2ba4032b607f68bc057c/56574027783.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/1ccfb7a1ba7346e44d6a0528a0abc2a9/4893983477.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/58030885644.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/20113703461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+reset+a+bosch+silence+plus+50+dbaPDF 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_off0000f487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 16784 bytes
SHA-256: f428b8d7fa148d6a099b5d47e778ec792bce2ccb67c6125116e7f911b670dd1f
font_01_sfnt_off0001204e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204E 11184 bytes
SHA-256: 57f4fea9ecd9e97cde3e4ced48d16df043c2be2c92848af27d42cbea1bbb4e40
font_02_sfnt_off00013a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1