Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fc22fc0331b76c…

MALICIOUS

PDF

83.9 KB Created: 2021-08-27 21:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0167cb8cb662be3fb09b0e7f72fe1e38 SHA-1: a8bcff6c8ac556b5fd87d185f323da58ac3b4622 SHA-256: d5fc22fc0331b76c06b81fae446bf9e21e99202ce5efd170e131c238ace05a02
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites. These links are likely intended to lure users to malicious content or further stages of an attack. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/gvjif0oei8a3qsdo7o908if76s/70977039613.pdf In PDF document text
    • http://apcmagon.com/userfiles/19533240278.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/f967731bed66d0db44979d74819de80f/31118186980.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c907621345---jojaxepadejorigotupuni.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/91869674230.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/gitajinabevinufutifal.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/23034484481.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082e48c464f2---busojelilafukobewop.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/64170866565.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b28f9958ec9d566f863753f424d1c599/71849524919.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/49787878242.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/792d0b1002f6061a3ea1ea20faead542/xedowimiwu.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/30898984549.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/863cse0nt5imrc70f79ignha51/semadukuzumaxarofuma.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/56e7bcb8421dc0c295b16b64868e2a3b/97917180026.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/57063920107.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/bunegez.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/k5gktkfcquq2jpv1npt0219h5r/50492053418.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b300135a79a---gonomujunudijosefukudevoz.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/57886715504.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/2f04c3d514d8809a38e551885dd72a94/gogazosule.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/fusutidetujizi.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/12422885379.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/73948788636.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/28538701429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=good+morning+too+in+japanesePDF 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_off0000daee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEE 10860 bytes
SHA-256: 5c8c5cc6443b896f892ea9f93d28abfefa1644e967999b9319f50770609ff647
font_01_sfnt_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD2 20492 bytes
SHA-256: be40a01f0325158fae0e9d3fc5f5e6480fe7dad1b5e695a696f25e04d1e02943