Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5011da435b3efe…

MALICIOUS

PDF

77.7 KB Created: 2021-09-04 05:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: ecf2a2bfb4d57c14ff5b74b0f2654309 SHA-1: d122b57c0e78619a7f5b28a63ea0ff1cf6e2915c SHA-256: 4c5011da435b3efe9e80cbeb0ccae55c65a8304fb68828870dac6eedd03fa321
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

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 https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fd919ff07---56372863838.pdf In PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/saguvelali.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/wepuxezabiruxeromimekerop.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/7317642717.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/69369189755.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3f26bc45f---6848353420.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/zunimevenanuv.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/gusalufixitov.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf59536154---86056413585.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/91142991663.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160afc1ea13388---63935454525.pdfPDF link annotation
    • https://hometeamcorp.com/images/usr/20204860284.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/4548326438.pdfIn PDF document text
    • http://inphilong.com/upload/files/58230386825.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/mobesigosotewamoretes.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/xewipunarofi.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/92654563060.pdfIn PDF document text
    • http://signauction.net/userfiles/file/bakavolatubetumelewi.pdfIn PDF document text
    • https://faceless.me/userfiles/files/repupusoxaxojakavile.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d0655b74633---zojevepokamode.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609874313374c---pogixinef.pdfIn PDF document text
    • https://digicpictures.com/downloads/53145953864.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/o2dd3a13hove53ubtanm548nvq/vofupesomusovaleratetefe.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/fanikuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=preparation+of+epoxides+pdfPDF 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_off0000fc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7A 10548 bytes
SHA-256: 0716b90cca1592b0de623df2f3c7a9d9a508eeb9e6b267471ee2017a00f967b9
font_01_sfnt_off000114ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1