Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ff224be4d4c80f…

MALICIOUS

PDF

66.8 KB Created: 2021-06-11 21:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0650d637b16a10d371cdb9b880bcac09 SHA-1: ee810736b50f80f7689e4b401ec26162ad8cac36 SHA-256: 85ff224be4d4c80fa0f8107a5631885c17dfe6f38b9532009a3b0ae932546843
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 ML classifiers, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories, likely to host malicious payloads or redirect users to phishing sites. The presence of external URIs and link farm heuristics strongly suggests a malicious intent to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8278

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://irlanc.ru/uplcv?utm_term=angels+on+the+runway+mp3+download
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a892bc93159651c7e0470c49718c19c6/nogurima.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/76l4cpn8ed65ok0usb5j71mj63/nurabidibuweveduxalojokal.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab94719727---55081960335.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/92060398069467642a49e09642ce40bd/13157114706.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f259407edc---17379104430.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/jijoxinawevonefig.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/j0n712psq660hhohdnvcp66nv5/sojawisemoxarozopoposudu.pdf
    • https://seitonsolutions.com/ci/files/zidovalarexajiwekikenij.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a015a903e2---65514634251.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/be9d6b0c6e571906d556196f80e918ed/42118986999.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607e413d5efe1---widijaxagizerexok.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/d99137f03aaf1750d97a50b23ec8f480/65029651457.pdf
    • http://alnoorcity.com/userfiles/file/zoxuwokalurinuj.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_off0000e4a9.bin
e1f251f6e9d2a843f73846d4a1af1943c1b3e54027968f2ef23fb4b3bceb38f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A9 5720 bytes

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