Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ee7623e769fbdd…

MALICIOUS

PDF

106.0 KB Created: 2021-07-26 23:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0eeaba434d615d6e95654c4d3dbe021a SHA-1: d37ef0ddde09213b51b176a906a4c7acb6db7ed8 SHA-256: 52ee7623e769fbddb56d47ce564155177b27d7667c7715a49516175b4cd597de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm used for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9892

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://janjoling.com/public/ckfinder/userfiles/files/rokumeni.pdf In PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07059a88b2---befezikovop.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607589c87e2c9---zulibexokinu.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/21628031269.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2104858ee---15702470622.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/pozepirosegul.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/48024938481.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/4d1f34c8fbdf8280722088f8c88ac3a8/89984975469.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f8001c62d---megixuxonevadul.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f36b55cc9b7---25880771781.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/sidopojexasom.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/remagedipewurubolaxozo.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41dbd118dc---66283114638.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfdc54a89e---27798202537.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/90139978135.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/83655049400.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/p4ue0bqnhu3utu0e38j9t21kq5/xuvopevemezolagevunu.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/widowe.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/29577440576.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/sufiwizepixoba.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/wowevugerinamogojifasi.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/nazuwalener.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078f20766e07---gewizemejobipuzan.pdfIn PDF document text
    • http://arslanemlak.come/file/63992402755.pdfIn PDF document text
    • http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/24643502649.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/93603116359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+interview+methodologyPDF 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_off000139ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AB 10952 bytes
SHA-256: 515af296410c7a2a752a3b55e593ac5c41c6f294c8c67a5daac03d316eb4a645
font_01_sfnt_off000152bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152BC 18076 bytes
SHA-256: 0a4f3d9c7642217183c4541a1eac2a35399402424df72b1c49cf9bfbd7e2e0b1
font_02_sfnt_off0001813d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1813D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1