Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f8433b4d75f110…

MALICIOUS

PDF

74.8 KB Created: 2021-09-04 22:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 526ec324640fbd26e03c0bddc544ef7e SHA-1: 0f0c3ea6097917840381347cb88f4ddfef226b2c SHA-256: 48f8433b4d75f110aa1fdfd4d2a2501ee19c1f150661e17aa4e99eb4a16d0d35
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 websites or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest it's designed to lure users to malicious content, potentially exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7248

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://f27szerviz.hu/upload/files/rarasaremoto.pdf In PDF document text
    • http://bomtvplus.com/data/board/file/20210513230048.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/56690703175.pdfIn PDF document text
    • https://digireg.org/upload/potuk.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/71263282140.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607695c8795c1---lavejemumubezexin.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/73706429629.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nadosekaf.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/72362999143.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1610f6308afcdf---72371967289.pdfIn PDF document text
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/losevewirare.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/zetenenutudoliluzilura.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/ruzivuponejajesobepi.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/28318644173.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c05e07d24a0---lozewimim.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609434afcd835---15262850501.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/jluqv6h7oh20sf9kbp6qmap2hc/53424962321.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c354c862a---28318388585.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ba226366c---binenidisidanedi.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/bajelepuxan.pdfIn PDF document text
    • http://furniture83.com/upload/files/muluwunemunikuxek.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/6cb87e8ce5465e6bc920efa6236980d1/fuzagufufuwutibaborobemo.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609778ca6c6f2---52926105005.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b759e704739d68902372afba49f1c782/leleforasogadexi.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1f186e79e---43042066312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=history+of+hybridoma+technology+pdfPDF 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_off0000ff31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF31 18676 bytes
SHA-256: 99171a748eadd73d64a2a9ca7385f0a2975240d63a0bfea9ddf0c93fb9560ab3