Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dcc920ca90b1e62…

MALICIOUS

PDF

85.0 KB Created: 2021-09-21 09:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9c24dc50bbbe825f6c5086d1136e4400 SHA-1: 30e43759d0f876fe5270f2d4a83bb21d10ddf1e9 SHA-256: 8dcc920ca90b1e62463ff4dfad06049e294a2d1d5a73b2e9bdd4040491574844
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs hosted on compromised CMS uploads and disposable domains, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and a link farm structure strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ocs6h71uaa06gvvoblntbqh7p0/relepufiwasuvul.pdf In PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/tekatonoraxebebavafux.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/46323667058.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16139509898c85---44878412634.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/69245753969.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/9398645472.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/10961665385.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/65282355028.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/81350039866.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109132211305607.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/78245172011.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0d0608202---xunofereserukutegega.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/80092899802.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/rekemugajeronerod.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/69696792670.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/54995308700.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/penituzidimudulofeb.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210907_30EF26F79019C739.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/1574325741.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/ruvunifekisijefoze.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021981420461072.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/ziliraduworixopegejo.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/pikadugugivumexonuwudofur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+kitkat+icon+packPDF 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_off0000da6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27D 22996 bytes
SHA-256: bd68dceead88569543a53699760d1d70fdf3ed0364f3efe62b6071c415f9f61a
font_02_sfnt_off00012f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F20 10232 bytes
SHA-256: b36010b32eb5b8a895bdee4ddcccfac9e292f6bbba6b3c98f77ff39ccfb3baa6