Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97772a5f6977da2…

MALICIOUS

PDF

87.4 KB Created: 2021-07-04 13:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d816c34339c7006ac7871a9fdb2cb1c3 SHA-1: 98e882b2a69fb87eb6e344e09f1bfa76d82f3e5a SHA-256: f97772a5f6977da2702a381735e5873e77dac31ae4d578f3aaeddeac3b833a3a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate it functions as a link farm, with a high ML score and ClamAV detection confirming malicious intent. The primary goal appears to be directing users to potentially malicious external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://logo4you.dk/userfiles/file/39545370662.pdf In PDF document text
    • http://centralcogtc.com/uploads/file/zudavulutij.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/43949938589.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/291917b5ba6e36eb61e6c91656672f7c/91454955029.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/87115004638.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/48959877646.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c7903120---65331288784.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b38f982f1---dirivajixasebinamoziputa.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22a7fdb724---vasunuxeligozewujoba.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/xadowaf.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/tbv5j8geeb6t2asdmr3sfo8dc8/zavedukekad.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/namatifarija.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ee32f383f---7391959648.pdfIn PDF document text
    • http://endemic-capital.ru/uploads/files/sogebupimebatatikamoxigin.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/7a04e91bc7705ae94bafc9375eff311f/xapozif.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/24452908361.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087653184bfe---19803244957.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/89367196223.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/34273738722.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/98448885496.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/gn1mur503h7nq46heuffh61bu5/nazuvufanoziwoxigokegib.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/f44c3b15378685b0d8d8635396cf458d/xikironixakozalo.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/texagukeduwumivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=definition+of+reading+comprehension+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_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 11024 bytes
SHA-256: ea7e20aa27632e11c16e35fa4d7f196754bdd52e2fe56bdf76978db7a48d955f
font_01_sfnt_off00010dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001260d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260D 16340 bytes
SHA-256: d9b1b0ec1eaddf92f700d3e8a6893b3e7dfa8c2723830bc84d5a0d6ca4bb43bb

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