Malicious PDF — malware analysis report

Static analysis result for SHA-256 30372758c873a823…

MALICIOUS

PDF

74.9 KB Created: 2021-08-25 04:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f07edc11412201953d2ff71ca11d138f SHA-1: fcb61a1f51273f253c0e7781deca1ffe0c9bd2a9 SHA-256: 30372758c873a823ad994986e6703812bed506bb68e2676fa9a6f96349ea38d9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially compromised CMS upload locations. While no scripts were extracted, the structure and URL patterns suggest the document is designed to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

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://aj-logistics.com/stock/userfiles/file/vajuvisuva.pdf In PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/vovodupatadivexajabew.pdfIn PDF document text
    • http://anm-av.de/uploads/files/44935895450.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/5727417632.pdfIn PDF document text
    • http://konberdbio.com/upload/files/50093227397.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/uuvf3l6ehc0hd09ro2qvud7p5l/mugopopomujurafoxe.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202108170101155430.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/99374411487.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/lowot.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16080931e7a733---99720773605.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/91297199558.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210719/1604146553.pdfIn PDF document text
    • https://aedwea.com/upload/foto/3971837111.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/lokemisiragupepeb.pdfIn PDF document text
    • https://bloomeng.com/uploads/86185708293.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/64024908852.pdfIn PDF document text
    • https://unosms.us/userfiles/file/divemowebepazaxi.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/96654058666.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6359e89dd3---99240439875.pdfIn PDF document text
    • https://samudra99.com/contents//files/mufub.pdfIn PDF document text
    • https://12shio2.com/contents//files/sobigekotepevafidulax.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16076a4451fe80---volezubovujowuxuba.pdfIn PDF document text
    • http://imi.vc/upload/files/renubonir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=a+silent+force+reading+answersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69D 16280 bytes
SHA-256: 7c7d153b58f72358c99c7529a859c3d79267ac12c23788be4a430e6b336063a7
font_01_sfnt_off000100a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1