Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7d69fbbb897505…

MALICIOUS

PDF

61.7 KB Created: 2021-05-07 08:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34f63069bededaf5877a53db19eca98a SHA-1: dbcee07c76dc826e98f01628376c35d946ef1030 SHA-256: 7c7d69fbbb897505b8209be70c91903f50b1fe18392e8046473025f0521074f4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external resources, many of which are hosted on compromised websites and disguised as legitimate files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware or engaging in phishing activities. The document body, though heavily obfuscated, suggests a lure related to educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8124

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://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5f9bb2f01---daluxibiditu.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ospvg90a2o8nb4r09ccjaf15t1/zafirorinavotebesow.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a21c01a9c4---budupexuzasusajanuk.pdf
    • https://acrgroup.nl/userfiles/file/96778471917.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070d889c893d---deroveneseru.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a82b1c2af---3659915659.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/02f5b0b8b731cd62ef646cbed171364f/nalotixevinoxujimasob.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094803eeda33---91421267166.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160786fa0a84eb---zuvikuwa.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160774f33be25a---40318648020.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/5369bc6900454129d42eaed7b2bca9a6/37496081221.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/sea74fomdjl6dit6ucqokc1hd2/31668766671.pdf
    • http://alexhofford.com/temp/files/file/xusawujopixozividitebilav.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b1f93f7ba6d2e8bc77ed3c43a982fb32/bixisubisudobosuditi.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16094c06f671aa---16606778998.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=crash+course+world+history+imperialism+worksheet+answers
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbb9.bin
541b484c6506a12db55de3fff6f0e954f9b0f6b51ac0454f2dd60017065bc304		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB9 5476 bytes

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