Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff74e85293dda1b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 03:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a39c0b4b0f659ef86a1b1888bcccbe2c SHA-1: 1138c80c93552a5e03c59ddb7419598be5177165 SHA-256: 3ff74e85293dda1b7c3d69c8e7cb549b413085ff865fa8e707ba29eca13a15e0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm used for SEO poisoning or phishing. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/d2nuqr1p01jknau56fh5rmfma0/9525130689.pdf In PDF document text
    • https://thokhoavietnam.com/upload/files/pobaxurerawa.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/78668343367.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/logofikamitenoxar.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733de8b1159---10125767845.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/09213d5856df5a4870a70964345d6c7c/beriwuki.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3be89d6ea4---fuxikomit.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/10596773423.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/15489842579.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/nimuruselo.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/4dabc58f8e1039a1bcc84fe8d819dc31/8662488073.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/nazusatufoke.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/45968236760.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/99409538941.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/givisutazaxifilewuxok.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2c29461c3---68586367981.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16110a6c9a1c74---selimiwumawerusa.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/4f4c7ae3c355234d427a7298d50d917f/jopirizamebeselipejemi.pdfIn PDF document text
    • https://hirurgija.me//files/4933749904.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/tqk0cd1igh3cg80djsur3eodb3/zilufajupaluzavawiziko.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/80925621332.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2e756d9bb---dotijori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=2016+cadillac+ats+v+manual+for+salePDF 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_off0000d72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72E 11168 bytes
SHA-256: 6d36b5df16d90faa00026c487149bfb543784f1d89b2f416bc3ea6f6b0801a59
font_01_sfnt_off0000f162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 18344 bytes
SHA-256: 56e72c834590653e9fa760dd073a2114314a251a87972fae702bc2f4b1a54eb0
font_02_sfnt_off000120de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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