Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a2d9eb71fe7751…

MALICIOUS

PDF

86.9 KB Created: 2021-06-29 04:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 76ac64f813bb2a5b248547551a0eeee9 SHA-1: d01cc16f40c3410bb2da416d4f1c01116df38faf SHA-256: 43a2d9eb71fe77512242e47dad4937c3758ba9d205001c45fef8d7779d1444df
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely lead to phishing pages or further malware, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3778

Heuristics 5

  • 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
  • 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://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986572f2e8b---dalojotovujepibukumuzoxe.pdf In PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/c02f76856ffc44a5effc928433ffe741/45772786200.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/birebi.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e93e3a672---47683345496.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/97175787777.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/4iikj6aavv0m4bqic3r3eb161i/zukunajovapize.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607868a3e3ca6---65846935887.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9bb3ea8a4---zupepidojagurevaliwanav.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/84227989312.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/s1ecb577ivuf8bf3c3avkoijtp/93654842747.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/826c856cf24cdaad465f8ccbf1d203e0/vujegelufeku.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/da6760256875976e8f403896753cb06d/pekevi.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/bulogovoruketogarux.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/95636402022.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/74bb8cea253bada7256c97f7e127d414/15936054209.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee5886cb2e---24435727008.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/tflj14281t6gtaq0u0rl6rqa3g/bekutukamakilepulosupili.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/mmme197o2ojv2lmgidbt0539ss/78151128164.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc360392d57---40751652262.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210620005138_898370398.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/dixesusuvasebomuberegek.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/1532kjur64b0m5kaqenkjd1cf4/xajigimajivifowuxozox.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/e4ee11ba0995bf27820ac1e1e7190938/21845368057.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/suvidudeliruwijuwirati.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/49489867860d68351c3836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+can+you+tell+if+your+spleen+is+enlargedPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C7 11088 bytes
SHA-256: 13e32947951c6ef5c4343ab65588c6c7f46382d34d1a25600719c516f2efbaf7
font_01_sfnt_off00012397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12397 17100 bytes
SHA-256: 82b94578f250b17f4989a4183acd6bf2a77b85f0b725fce4ee304207010c662f