Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3154d044e8c957…

MALICIOUS

PDF

88.9 KB Created: 2021-08-13 19:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 4f204f41caeb4ac026fd3118fb7b9b7f SHA-1: e9abe91bb41c59737f1bc41da1cdce88a36e7af3 SHA-256: cb3154d044e8c957260e9490be4c378a3162ca6426fba243415df62bca7f1a38
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of phishing and containing a lure for a password-protected archive. Multiple heuristics indicate the document functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains, suggesting a downloader or redirector role. While no scripts were directly extracted, the presence of embedded URLs and the overall structure strongly suggest an attempt to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ligneus.hu/upload/file/linulujuvaxem.pdf In PDF document text
    • https://towa-aaa.jp/userfiles/file/puler.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/pojikij.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097644501958---kuzarigufobegonizunot.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/amgdvk48ack6eidf95j6uoh44m/fidalexaserabiruzozegu.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/81175479649.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097af36726b1---84550851099.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/bepewigamoturetelodoju.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/27081cb9c5961b72c3c47fcf39ba1aaa/jawuwisulem.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/49391759592.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/79872905523.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/dirofumomixodasiposirewi.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/38330845389.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a562ba8251---feboxofuvigutirukiwa.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/kafirevulitigataxate.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b7565474e---gevilanop.pdfIn PDF document text
    • http://calliopegoodrich.com/clients/73417/File/pabosasujinedimubonol.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/2f9f0ce4d88476e6dd6afcde356fb1bd/wezesidud.pdfIn PDF document text
    • http://mid-europe-ex.com/bavub.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5a56cbd5c---bisegixonanubur.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/46727089860785c8aa91e94fb5091e76/lerafilupokofozapeka.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/lobatosiguxorixesek.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/86254175369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=descargar+menu+de+hacks+para+among+us+pcPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF481 18164 bytes
SHA-256: 91d12c5343625ec0df8c7a3b3cbf43c3de2a16bf01bf32ecd540402dbd8c2bfd
font_01_sfnt_off0001231f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B36 10916 bytes
SHA-256: 323d07074fee6ff18835c6daea2551e3bbe9b7bbd31ec2348aea59c437299e11

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