Malicious PDF — malware analysis report

Static analysis result for SHA-256 88402afb34072687…

MALICIOUS

PDF

69.2 KB Created: 2021-09-19 03:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 34bd8c01244fec3068190058096728d8 SHA-1: 2e102c2cb2c3d021b4e31178ff323372c2a3afdb SHA-256: 88402afb34072687f2f03183775f16da182f21dd2874435223e9b0f11cad6a40
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The document body was unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5877

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 http://nbc.ua/design/pic/file/16485932586.pdf In PDF document text
    • http://kirakuramen.com/uploads/files/64112353798.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/34736631834.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/46259003962.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16144743491b76---37730197544.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/vepufidaxujom.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/99340780961.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/terodipizupez.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/83866802796.pdfIn PDF document text
    • https://robodom.si/files_vsebine/91531281346.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/52154948191.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/zowusifub.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/metijemukidubugu.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/86283159901.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/bibotuxunidudagu.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/gagesigeruradozek.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/70910942003.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/vokefenu.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/9341678364.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/vutupatiwafelikerotal.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/nabidaruvepakedineg.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/260d8a2dcc6ef02db1f6659a4ee3859d/24396807513.pdfIn PDF document text
    • http://entrackintl.com/uploads/sesasoxu.pdfIn PDF document text
    • http://ewtch.com/upload/files/64212773123.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/22824210110.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/terabanogirefokeli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=42+inch+led+price+in+pakistanPDF link annotation
    • 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_off0000ec58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC58 18044 bytes
SHA-256: e3b7cdbe8261df5d4ffb0af4f24876add5424a4b2a78888b7147671ac2bc9e5c

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