Malicious PDF — malware analysis report

Static analysis result for SHA-256 616bca42de9c4706…

MALICIOUS

PDF

64.2 KB Created: 2021-09-20 05:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 05dd67865ac8745d39d465f763a5576d SHA-1: ed23d36da3dfbce794f40aadfc5a149f29a8710a SHA-256: 616bca42de9c4706ba320994254865ed71ad6fac7db507fbbe0bd73ac945bb31
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The primary function appears to be directing users to potentially malicious or compromised external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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://primaria-ciocirlia.ro/media/file/37385223931.pdf In PDF document text
    • https://nedimgame.net/calisma2/files/uploads/jenupabukokavajebe.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/rupeg.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/gumup.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/19454256475.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/82021338853.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/40247266739.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/guxazu.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/90697590316.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161463e512a3e8---buwigugesotadix.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/darilenesamedekesidajor.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/32412373320.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161338252d68a4---nedufugexovesigiferi.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/nipojekubelofarokujob.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/doregutilax.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/73205903144.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/lamexagosokileli.pdfIn PDF document text
    • https://profm.hu/files/file/gideviwiponomewox.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2eb286650---rusodovategez.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/13339516818.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/lotufu.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/10928649548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+do+i+hide+my+phone+from+showing+that+it+is+connected+to+wifiPDF 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_off0000e4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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