Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ea494fe1e456c7…

MALICIOUS

PDF

63.7 KB Created: 2021-09-13 05:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec55aaf95460f8d7dcf356517bebeb0b SHA-1: 30a0cd65ba800fe4f796c456368a5449a3d87485 SHA-256: 38ea494fe1e456c7fb674bb6113836ab07ec587f321e0c3209d448edb98ba29a
174 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7731

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://roland-toys.eu/userfiles/file/9371650527.pdf In PDF document text
    • http://turchifiltri.com/userfiles/files/88213919659.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/51090561774.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/41727727345.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/5155451660.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134a2874f1bc---69413943549.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/45380910896.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/segubesozuvarixixolejusij.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/66493356727.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/tagif.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327e2417faf---gujagobuna.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/dusixe.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/59496626459.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f45e61dbd6---refavowizaxakatepogufat.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/besidaxepepuvomejo.pdfIn PDF document text
    • http://pileki.com/imgup/file/43026878978.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/wolisiratovuwojo.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///romopotirapogilut.pdfIn PDF document text
    • http://thegioioto.store/upload/files/vefabiwizuwivigi.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa69dddfe4---14529335901.pdfPDF link annotation
    • http://budka39.ru/files/40344184868.pdfIn PDF document text
    • https://verner.lt/images/files/19228670970.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/59456266925.pdfIn PDF document text
    • http://zgic.ru/!upload/files/81560564547.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/sejaxuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=gmail+apps+for+androidPDF 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_off0000e897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 10468 bytes
SHA-256: a27c120611ce877dd117efdd6eba6930e6494d401dae4ec6978ccd86dc7939ea