Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c707991d8c9518…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 13:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7cf05dfa97f0628e3c7e9f5165ed1369 SHA-1: 8f504fe2088305a96fa57bc367afe49f84d319b3 SHA-256: a2c707991d8c95184e4dbf04b13e402f630bf1c6f7b24ea9362142c14542d066
154 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs pointing to external websites, many of which are hosted on compromised CMS upload directories or disposable domains. The ClamAV detection and ML classifier indicate malicious intent, likely to lure users to phishing sites or download further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5648

Heuristics 5

  • 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
  • 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://playeasypiano.com/resources/fck_images/fezepalazad.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/199a00080917d177714148edb68deb09/widijuloziras.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/d49eehbnhj6e9ildr7ch70nhri/vunuzi.pdfIn PDF document text
    • http://honghuibio.com/d/files/10917886345.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/70630860847.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/39911155400.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/karitepugedobibebiri.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/huptmttd27tt6f7v5a9t8uif4m/zuxiwoxikobupukivuxuram.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/99853569763.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083e355dc4ff---ludajepojotidopun.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fea1d68988---39973366458.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/265bd6bed21963e976e0d02b348f1c88/tupivajibunufovoki.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089536ea360f---gimogaruvemir.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/67302465306.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/nirudiparitapusaxuxobe.pdfIn PDF document text
    • http://domplus.su/userfiles/files/sebezegopavedupubiza.pdfIn PDF document text
    • https://coil.hk/upload/files/wiwoj.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611555960cb55---xodijoxot.pdfIn PDF document text
    • http://jogamiskolc.hu/ckfinder/userfiles/files/subazufezelamagokezojeju.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709ac114389---13758881549.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/d66d7e6e26cb9d1c6da7821b6b5cd788/mabujusunuka.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6207079e36---nakewubage.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9614cc9fc2---jirirudojaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=addison+disease+pdf+2016PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12609 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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