Malicious PDF — malware analysis report

Static analysis result for SHA-256 44cfbc5f3a827cbe…

MALICIOUS

PDF

97.1 KB Created: 2021-08-01 01:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: bf820b97b0fab3f3d0772372ef7e3db7 SHA-1: 4182851b388701eef7128e64be9a55437ad6c728 SHA-256: 44cfbc5f3a827cbef17428c2c8c6c2fab8971a42f0f2f935940922547f6d082b
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 WordPress sites acting as link farms. These links are designed to redirect users, likely as part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing attack delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef5937a96f---52961660069.pdf In PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/38715237991.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/71593866863.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/52586762105.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zuzipazuvujizusasuj.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f6d7c35d5---kemuxejobosojejamojovi.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/90900007133.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/1adacbec520431c08485a7e16016a017/wewupotarutasirepotan.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a43714e2564---gexokadomiziresekem.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/fowugatudibepomiru.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/kivumutulanetur.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9425a3da92---81388467869.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/20219227905.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff0797c92---90527784040.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/07b7da64f5d4160346ca444f6be23347/17579552750.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072900320f49---nakarajukizulo.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/zixamagazevema.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8d8047341---nawixugonifedewok.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/88175949867.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kowopegu.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/kejegajirizoletixet.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vibusowirineloketovunij.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/vd9sg2vn54mnsvjn8o556l7dul/gelutisadazebapir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=character+profile+worksheet+for+writersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000facc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACC 17568 bytes
SHA-256: c4566cba53575e1280cc90e99b07f8a2bb4d4de04aad7a87ee9bc630b9e8f47b
font_01_sfnt_off0001280c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280C 18204 bytes
SHA-256: 6f3dc3dd3aba1e88ab3ff81ab09d96f1a6238354f1f2450ad809aac3f52fcfba
font_02_sfnt_off0001437b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1437B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B92 10680 bytes
SHA-256: b9f86b8f4e878bf3874fd1db22a832fa56b9de1dfbc8f66e0419c7044d8facaa

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