Malicious PDF — malware analysis report

Static analysis result for SHA-256 11107ac7f34acd14…

MALICIOUS

PDF

76.2 KB Created: 2021-09-06 15:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cdfdf23c7d8393d653fc41b0c65ffcdf SHA-1: 7ab35ee3d1d45bcc76deb545496c663c462805fa SHA-256: 11107ac7f34acd1485abc6a51172f5c277df25c4db9043a474ec5b0f6d4b6aa4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or malware distribution lure. No scripts were extracted, but the structure suggests a malicious document intended to be delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8757

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://chcial.ru/uplcv?utm_term=union+budget+2019+speech+pdf PDF link annotation
    • https://almondzwealth.com/administrator/imagetemp/file/laxex.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a96d8ed0c30---jizuvo.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/xivagefi.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2c9e89206---vunanepi.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/gologexanisekuf.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/83658678344.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/davuxe.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-7-16/20210716021608492931.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1624367199.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a401caa7bab---fetetixikimezi.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/55621393076.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/pifevivaserodasewifaxoti.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/kutizowil.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/lakupekat.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/kixafisejedaxaw.pdfIn PDF document text
    • http://namhunglogistic.vn/site/files/gamazafigokes.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a37ddf2362---midorikiro.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/38580821886.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/gotokigodutuviwidulil.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/62126259478.pdfIn PDF document text
    • http://anpharma.net/upload/files/10089015200.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/99782422234.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CD 18428 bytes
SHA-256: f4a9c891da55f32870d9825f790d1f038dc9c04020ff877eb532ca8690ae7224

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