Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ccf2574d271bc8…

MALICIOUS

PDF

76.6 KB Created: 2021-07-03 03:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1a5aaa8422bb9f073bd7d0202dac6e6d SHA-1: 92fc95f3616ab452eeb4aac04b219007a7376729 SHA-256: 39ccf2574d271bc87f9fa523350a4aa9b4f333b7c29cc50892b468b435496c83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which point to compromised websites or are part of a link farm strategy. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ka-base.no/images_content/file/sarebumixu.pdf In PDF document text
    • https://12shio1.com/contents//files/fosupeg.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/94153511823.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/71784160776.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/ruranowulubi.pdfIn PDF document text
    • http://araonline.hu/uploads/file/29010020911.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051600585873499.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5f455b725---31573249397.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/30474163406.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/famokexajovap.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/xenovapolifagipurif.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/datuwisububumosivutexunew.pdfIn PDF document text
    • http://fruitvita.com/files/files/lamakejiraz.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/927cc9d632c44f31a3f1a348b4460ea7/84351599719.pdfIn PDF document text
    • https://tycoonmarine.com/userfiles/files/zawekinulasuxu.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/53b24a3edacdba99aa19ef582793a689/11021700405.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf4b804070---vekuvozivabevat.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/32397308763.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095aa5998e2c---taruxur.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963aea20a49---28609771122.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/xitebiwulavekotofibedoxu.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/aad360dea221c13a4edaad93a98fcc24/86243202111.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/in4ucr38h5epas7j4c1us3stpk/23410286973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=solutions+third+edition+unit+1+progress+test+aPDF 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_off0000c7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC8 10900 bytes
SHA-256: c4bbb1efac1cacd7a598bd5b07110da75ac17d9536338e88d5d04171623fede4
font_02_sfnt_off0000f8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B5 17064 bytes
SHA-256: 7b5298d64bca92f3e28e1c0373e461fce4fe4ee8b80e1e9d90d96aef322926fe

Open this report in the interactive analyzer, or submit your own file for analysis.