Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb48e8439bb5c857…

MALICIOUS

PDF

82.3 KB Created: 2021-09-22 11:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e9124b2e66758dfea1c385c1f1df912c SHA-1: 178761d50c93cbc0ff828090e67d55fb16232eff SHA-256: fb48e8439bb5c857d0819d19848410616236de06fa15435d2ba54afaee0cf5ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. Static analysis revealed it functions as a link farm, with numerous URLs pointing to various websites. Several of these URLs are hosted on compromised CMS platforms, indicating a potential phishing or malware distribution scheme. The presence of multiple external URIs and link farm characteristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://haraj-alqunfudhah.com/userfiles/file/59699138698.pdf In PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1eb7d7ea3---60745718372.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/29966813669.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/70268332447.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/969227422.pdfIn PDF document text
    • http://zxsolar.com/d/files/57803097855.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/zogoga.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/wogudonabifujale.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/3162220629.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/91250826781.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/51251550071.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/72416635695.pdfIn PDF document text
    • http://inica.org/files/file///tejovone.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/sabem.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/72145335879.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/45468822819.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/79818217684.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/38621959978.pdfIn PDF document text
    • https://olterus.com/contents/files/retidusavutijumu.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333bbc1fa82---nogijewujesozejupifo.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/81867279133.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/4205952703.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142915bec270---beribeniwesutujakopi.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8069d41c088ad78699aef04bdd335a7d/zefasuxorul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=playstation+2+emulator+androidPDF 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_off0000daf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF6 10744 bytes
SHA-256: 7c4211c60fee773e7342b78213793262c813dbd00097a1914c0142cba0aa5615
font_01_sfnt_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 18372 bytes
SHA-256: 336a1a22805ebe55de1c79473ace603e56c1bba4ee53ffcbb00d90f5cd939d4d
font_02_sfnt_off000123c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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