Malicious PDF — malware analysis report

Static analysis result for SHA-256 26786ef2b02558bb…

MALICIOUS

PDF

65.0 KB Created: 2021-05-22 14:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07e39cbc4ce114680de4f46af990a953 SHA-1: d2d8df948b50675911428f584cbca4f59a57c8b2 SHA-256: 26786ef2b02558bb1198314182d4acd6c8cd896e68f847d8ca01a5e4b6409dec
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8592

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 https://ketchas.ru/uplcv?utm_term=how+do+you+use+oximeter+app
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bb93de3f9---42133242292.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754fa5af65d---xirolunanukafixopevape.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/d01ba3dbbd508a27ff588f57a75610e6/lojipilabaritutim.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760c3329a48---rimorot.pdf
    • http://vce34.ru/attachments/file/sanomasadiwitasatemoj.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/sstovencmb9r0b8qn3vmv635k7/86746291899.pdf
    • https://cornerstonelaw.eu/userfiles//file/vulinofesokojowarosunox.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160787720d58c1---77990934410.pdf
    • http://mg001.cn/upload_fck/file/2021-5-21/20210521105014402420.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/bolmqbs6o4mgfj22f2oblv30e4/48276950803.pdf
    • http://2ds-creations.fr/userfiles/file/segaloxibotexipikipedabej.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/0b521e8c2982f92451976a6fdf7f3a13/kunujedezonibuwidusa.pdf
    • http://stark-tools.ru/images/uploaded/92228303586.pdf
    • https://aimhc.com/userfiles/file/gegusej.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160772c14189fb---tumokijizel.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160945927095fa---folox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d178.bin
6b3ff8762c287ae3bb7f3a6215043d3eda793845882d1f28e042f7e7432c8bfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD178 5296 bytes
font_01_sfnt_off0000e37b.bin
b4e546fe49c61e9fec001f6403cb9a3b6482facb58afa2a2eeb5b12d26f0abdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE37B 10168 bytes

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