Malicious PDF — malware analysis report

Static analysis result for SHA-256 864c0c5cbc65f021…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 07:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d502405ed207d2cbd98bccb1642a3c3a SHA-1: cbfb15b5dd105240a92ccf0081ace730c8e66f77 SHA-256: 864c0c5cbc65f0212a3d8b7e4f1f8b574644b5fc31c92d184c3d8f132bde5994
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ae613e00da5---moxudezasinele.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1abimq1ih3nu160nv69ilo7b0t/wepok.pdfIn PDF document text
    • http://foodchemsino.com/d/files/26894776086.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/82429447741.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/34780513563.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/zaponepirigami.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd5fcf36a7---wobubodesixajosofapetev.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/26735671953.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e03c42f15de---81665539589.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/84110696012.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aac0b8bd2e0---jaxiso.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/pigisekolejo.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/73850175631.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f5e64c78fea---zedijebuxutel.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/gajagegupewiputekimipeli.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/65026772265.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/b384cb6d808a1d2cd23d0b09f0647a2c/tafenejebutarananiwikemef.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-14/20210714122030240808.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/jifizu.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/72e1670d37188ae2fedc024311e9b7db/9603099406.pdfIn PDF document text
    • http://bakoca.hu/files/file/95221028121.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/fixuvekinuxugideguwig.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895a8744020---22546344986.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a02e00048f---58032473189.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608a250c6fbfa---56504178348.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/77319457950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=st+paddy%27s+day+cultural+appropriationPDF 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_off0000db63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB63 16864 bytes
SHA-256: b398474352680a01525670b4e8434063af3821d5cb6a4d9e07eb6e7090da7f91
font_01_sfnt_off0001075e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 10696 bytes
SHA-256: 17de06620880c90938cce3e0b9e0bb465fd816a07c9a78e7b36b386967616928
font_02_sfnt_off0001200a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1