Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbcbe90db9ce7a03…

MALICIOUS

PDF

83.0 KB Created: 2021-08-20 05:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 60c7bec7fb60765ea9754cde8dc96a55 SHA-1: 47b88ea281534a2f525350307cbe45ceb679b3ab SHA-256: fbcbe90db9ce7a03108b62390606feab4cecd7b1775f89483396d7a1378821ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of these links, coupled with the PDF's structure, indicates it is likely used to distribute further malicious content or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://curvy.tw/upload/files/27525839863.pdf In PDF document text
    • http://ural-resyrs.ru/data/file/14107231880.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/89754534613.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f9180a76bee---fukexexemibanamuw.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5330cd2361---gorikafalunobavet.pdfIn PDF document text
    • http://cga82.com/admin/File/vejiraseta.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/62ab8f83875e351845281f686b3da7e2/22567856914.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/m8jmdgus10r7juecnbtc2v7g6s/75120383250.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/1209274897.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/5c3fac4deaa6ca84b9fa9e2e20186b0b/fagufojuve.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/90070956331.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/97217117228.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d485aab8f---rejivad.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/81460195940.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/85134232911.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/dajuvuridokusa.pdfIn PDF document text
    • https://anaksemut.com/contents//files/53010273816.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/73858024512.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5u124pk2vnsmrc7v2dhjb94tum/nitapo.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a47494cbe23---wubisugudalifomijefot.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff8e9e3dd39---xopokiwulatisusaki.pdfIn PDF document text
    • http://cke.hk/userfiles/kuxoxomumel.pdfIn PDF document text
    • http://debden.org/userfiles/file/bagubuwurotepitoni.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/votaboja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=compare+and+order+fractions+with+different+denominators+worksheetPDF 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_off0000dcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD8 11048 bytes
SHA-256: 4686a7323ec652d0afc0c5b393b5cb9d5d927c64f5061193a6b8fa79013b7780
font_01_sfnt_off0000f675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 17076 bytes
SHA-256: 85b4961688191c72d783841119fafda9833d77c3fa8d19f27c2ffac60851606f
font_02_sfnt_off0001232b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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