Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd16957242c3b094…

MALICIOUS

PDF

81.3 KB Created: 2021-09-03 19:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f39989fc3e020ae65ef526955c346cdb SHA-1: 61d9efc248a1279c87c4941963516c45f621ced7 SHA-256: cd16957242c3b09419360fec0463e03ef1b469cd9a4ab90403d657c3b9fb880e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The heuristics indicate the PDF acts as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bfe901a5e---vosavakaragijuvus.pdf In PDF document text
    • http://travelshops.pl/userfiles/file/42913034710.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/zatusosore.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c15242855---26250207414.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/suninurinimabegejefuzuzez.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/goxazirurananikazaxiwuz.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/26338768465.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-23/20210523220955381920.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/rs71g488chjm6ci5sta0gjhstv/ludivubamuvu.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/277128737.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/1875d042f0d3f84db2ffaaa6f2a3d1ce/30181285921.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ov0mec5snjcgchn82iubbgtcu9/nedomivutilitobozirete.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/40521323021.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/ponefopulapekopimisuweta.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5c7173b51---38961067301.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/51685103355.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c42117b2d4c---xepedezafe.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/24073719562.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/0tnq0i8gnr76u3h23ach1lnahv/4609778190.pdfIn PDF document text
    • https://digbijoynath.in/iisc/ckfinder/uploads/userfiles/files/zevedaxowozoluruxuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=filosofia+da+educa%C3%A7%C3%A3o+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_off0000d529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD529 19536 bytes
SHA-256: d84f5dc1e3a83f87021c1da7b63db6086e58a398d5058eab2889f4a5836a02ab
font_01_sfnt_off0001055f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055F 10852 bytes
SHA-256: cab9d6227e9d9f06cd16dccc07cd1e371cbe07f5ae182af3f2d0a8acd92d2923
font_02_sfnt_off00011dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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