Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c86f74263dbfffe…

MALICIOUS

PDF

86.6 KB Created: 2021-07-04 00:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dff4d9f55bdd26f7ce0a12f9028d202e SHA-1: 71daa347d07dfaa8fa16f66b6b45f3f7f049b4d8 SHA-256: 5c86f74263dbfffec747875d4ab7ea0bc714eba12fdee1e270a3583c5ef0d8b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ttc-investco.com/img/files/27178909542.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edb965ef54---46821486527.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da16037330---83675682440.pdf
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/dagositovovokaxo.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/bbf1197cfdc69146c25ca236da967570/14088361113.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160db89d9b531a---vorupeniwanogivubilenevez.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7ae42cfef---raxebetojigunid.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b963eaed412---fefanuvimade.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c184514217---lilijirodepubuxexigofi.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/478381cbc83dd7ca9014a2e8e75e8f72/wojajutenizofamalejasesu.pdf
    • http://apluskleaning.com/admin/images/file/tonamebezij.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9499da8985---76711485573.pdf
    • http://gintaras.cz/userfiles/file/losijubuxupegopimiwilur.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d2a31c439---momuwevasixatadimovi.pdf
    • http://kistours.hu/userfiles/file/famikowawidima.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaa7c901a9---18663988247.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ebk49t3omaqd1h5egvfm1q9om7/50683756866.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe24a573fb---vemipumozomodawerajatu.pdf
    • http://skogsformedling.se/bilder_umeny/File/bazivujoverurikof.pdf
    • https://dpmceramiche.it/file/bumuvoxorixepajeluzojejej.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6172b1fe55510251364c32f762a436cd/fidezan.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916ffca0eb2---resajer.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=repointing+gable+end
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f042.bin
c38829d32d0d40a2a47cf9dcb7d1018422c86dafaa8d1ef99fa1d669d6ea4d85
pdf-font-stream PDF embedded font (sfnt) at offset 0xF042 17720 bytes
font_01_sfnt_off00011dc8.bin
3885876a1efe54d882bd6e882b70188d11c42bb8cd3e5ca7714f874f1e5236e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC8 10484 bytes
font_02_sfnt_off0001353e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1353E 16792 bytes