Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc2fd379f10bf95…

MALICIOUS

PDF

102.6 KB Created: 2021-05-01 12:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: fdd138dd3467b8c54caf0639e220dfe9 SHA-1: 8d2295ff8c5a97e17f343b2d53c361d0c7dcee98 SHA-256: fdc2fd379f10bf951b19b1137bbdf0b11663993e91ae29968b78b394925824da
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories, likely intended to redirect users to malicious content. No scripts were extracted, but the presence of embedded URLs and the link farm structure strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7898

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 http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607ada156a752---57390030025.pdf In PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/vh6d30kgq3c1jaf2qhf5knf480/49720739001.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/01d1c8caf103267f678ca7c229ed0c05/42126609611.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/33092710025.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160700146112c2---16840320740.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa3ddda97c---wasamoni.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/3092415808f8e75d606bd9fdf7979548/duvowozeneto.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/dkjqa2gjqjjovc7r2lece17aef/89121600943.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/89268fd00549ecdb1524af35a14a0cd8/xilelomegomomap.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/to5nnsrcam2hrpa9og3ot9s153/xugafexapekimitoluvif.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/35v15akdsd015m1uj0queopv17/58690863975.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/4cedb5340aaf57cfaafa84d3814d1ee0/folewurufegezajosa.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab3de5fb88cbb3e236afbcfdc9eebf78/7390758759.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/h6lj6oc5oj4jeap491oge5lk26/xikekepixasojon.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160736dfadd4f7---levefiji.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/jhpjovitlq0f42on35ppsditha/57299135785.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=hollywood+reporter+35+under+35+2015PDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B33 5332 bytes
SHA-256: aa24dc808fc2fbc6da8643128d6ca99166134b904b04e758a5171054f70d1a04

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