Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef2d813a0b88907…

MALICIOUS

PDF

72.7 KB Created: 2021-09-03 09:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c5e3f96b9ab72864776b14d3644ba55d SHA-1: 7fbdba7823a2858065ce95ec6744aca8c0916c7e SHA-256: 4ef2d813a0b889070523c4114aa706d989129944cbd9c110b13e02ef9ce6ab65
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://marwaautorepair.com/nbloom/fckuploads/file/3759982191.pdf In PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/2315378845.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/xuvurenew.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/55518029625.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b37c15ab0---75018674110.pdfIn PDF document text
    • http://alkanboya.com/files/file///jujodagagafure.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebcf27ef72---juxol.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ekixa.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/xuzase.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/jitemumudakomufelobabinez.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/jeguzukewadatanedifakufi.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/bitakesubifozitifi.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/jebikoxafisodotu.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/rr3bv9gfcf4m89msf4h6nfnsg4/93013225221.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/89707523248.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/zapolefupetox.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202107021920289590.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/99396928849.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d469becf45a---12897466945.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/rukuvafakawozomapadoli.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/80477937290.pdfIn PDF document text
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/nukagujapelilupudezatane.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c7cfc71d3---31913867509.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/73278438510.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/87720320209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=rein+quadratische+gleichungen+aufgaben+pdfPDF 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_off0000b77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77B 16636 bytes
SHA-256: 52f0778b0e04cd956381c1c41897a846f74b6560603a72b39681a256d89c1341
font_01_sfnt_off0000e182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE182 11212 bytes
SHA-256: 819db71a2ad56ddba42ce94ae1f5ec6684e8577587cb235184ca2de729d444a6
font_02_sfnt_off0000faf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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