Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc64178bc3e78083…

MALICIOUS

PDF

73.6 KB Created: 2021-06-12 09:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3baf0aab1bd3696488d46002a9922bda SHA-1: f17dd358e437e6b6dbf8d35e73b6a2112c117aa5 SHA-256: fc64178bc3e78083d0375d36d87b433945cf8c2ac4b5996c80cfede928aefdd6
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or scam attempt, likely using JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8945

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 https://coretry.ru/uplcv?utm_term=ark+survival+evolved+best+dino+for+wood
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/bfcp69416pbs0f276kepgcfoec/27012407702.pdf
    • http://praconsulgroup.ru/pict/file/55195956370.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0b7c872c37519bc3d213bd9a6bcb5538/89081998210.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/ebccde6d1c75908a94aa86869eb15854/36667286.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160822c1db8522---27553177300.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b83448f241c917b5e306dc8dbefee50e/72579837788.pdf
    • http://fujavietnam.com/images/Download/puzuvilazilenomeruxaner.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/92a623788c6b50a2158d4c97144d88fa/situmewatixuvebejod.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5528a64fd1---lapevavizulebipat.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/k7rsb7k3mtpauf46h4ftk84106/fifapofovofidi.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718de584c64---82056200644.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f855ff204b---varulidegupusitagekelu.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/0b21479079889ce7fd4931eb0c07f956/92892667241.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/268128b64e50f9acabb2b9001755c657/linuguga.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607676a626044---lapujiworelovipatodalim.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160adb208060a7---tomupej.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/2268bd7b5ecae9de803a3621c464bf3a/mobamalinuw.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc38d73b96---17084509180.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010240.bin
b231f2759cc986ae74f1ead5c17dd73f7a2b67bc39345fe04c24020ec8d0832d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10240 5248 bytes

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