Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c854038a0abb8d8…

MALICIOUS

PDF

66.7 KB Created: 2021-05-27 20:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d1934e85a3fb917985ac12fd89ecbff SHA-1: a792ae4d75e59bdaad3e79104cd872a4729402a0 SHA-256: 1c854038a0abb8d88c1db7e05b90f46ce1bf1229d0195b2099698eb9b12448a2
124 Risk Score

Malware Insights

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

The PDF file contains multiple external URIs and links to compromised WordPress upload storage, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body, though partially corrupted, contains text related to educational topics, which is a common lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

Heuristics 4

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=lgs+ebob+ekok+%25C3%25A7%25C4%25B1km%25C4%25B1%25C5%259F+sorular+ve+%25C3%25A7%25C3%25B6z%25C3%25BCmleri
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d39258df79---vunipasodajovipizuxeliseg.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e915d4cb4---rizugala.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160853562efde6---64102042179.pdf
    • http://littlepearlbooks.in/data/eimages/file/wekip.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0623e43b8---kekisazefofo.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/d4ebe2f0e18e7921036b4d43c53cf240/29004509004.pdf
    • https://travelsafeway.com/userfiles/file/24834930024.pdf
    • https://aplusadvance.com/naver_editor/data/file/84750249392.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/4ace6ea35be773d2913b4e0a2ec95f10/45318829574.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/25e1c50d47cd676151836cd2884c1fe0/1933134385.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607431da1b963---97502792585.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c19be47f---36970976535.pdf
    • http://popnmusic.fr/userfiles/file/13442703744.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_off0000d1e8.bin
756a0be7ff3b1ca5da738372b63fc9be40881f1e5fe76194672137a4fade6b1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E8 5676 bytes
font_01_sfnt_off0000e41c.bin
1b53889c392224ee6867eeb3789562998399b67a7a4bba604e354c7ae0f4c53b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE41C 11448 bytes