Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fff9028199841d1…

MALICIOUS

PDF

90.2 KB Created: 2021-07-22 03:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 83937dce2cbd3aef199700d1d434433b SHA-1: ceb5634385e2231143334e92ccb97bf9a79706e7 SHA-256: 4fff9028199841d15294af3100652e3e9a0bb8de15655c6a610d866c269ff817
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload or lead users to a phishing page. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4997abddea---dezevesubujiwubofepax.pdf In PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d31b7d8ff0f---kugutevonamoleravelil.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071af2b89b98---99381977983.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/3089631773.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/zojurufinusabotoxuzebiv.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/gugolipolajipapojalu.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/32b2774ee22b31a805f2ca6508ceb32f/61401529679.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc35027781---rogux.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/tejulabuvowamurofoxusuno.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/tukijavubodigofuj.pdfIn PDF document text
    • https://raljob.com/userfiles/file/wenikep.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/pufofeligatabew.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/afe2d960564df7295fcaa188c6ad544a/26761486547.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f0qheqp04n7pe1v4i595kk0vp4/73602464148.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/tajujepivenawutuxatiso.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/xinoneju.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/bcd608fccc11695b80a79aa44760546b/gabajoximatezabademibozi.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/7834564226.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f0b77ccb8---56961711998.pdfIn PDF document text
    • http://jarosi.hu/files/file/dapekufok.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/letapidimetu.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/vikadidemijanajoxozo.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/nuzepinerizazonatuwe.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/guguvilaxogamiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=magenta+stained+glass+minecraftPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 17456 bytes
SHA-256: 853c6bdf2c04f0e7023c73dbffad37ba333abea51d2205667f77debc3cb588aa
font_01_sfnt_off000129a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B9 10692 bytes
SHA-256: 79a497a915832d47b514dd8c191772fab6062fd0725f0264532dbada5cefb6a7

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