Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbbb5f0e622a9384…

MALICIOUS

PDF

77.4 KB Created: 2021-09-03 20:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fbe033389ce9e5f049a32709d361bc90 SHA-1: 21799bd59cab974732c7fc9747f839b43068c111 SHA-256: dbbb5f0e622a9384e6044ea371570cddb53ecc8b63fad0ff253d9a1f3a5005ca
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, directing users to various external websites, including one hosted on a raw IP address and others on compromised WordPress installations. These links are likely used for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nomylo.ru/uplcv?utm_term=polaroid+tv+manual+buttons PDF link annotation
    • http://slhospital.com/upload/fckeditor/file/kubit.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/mijupararilutoso.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/js7ea0rebndu1vgmv0shv6e3h1/rinafokolo.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891673cf49a---15543040044.pdfPDF link annotation
    • http://sva-jeanroze.com/xmedia/file/7035390658.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/30377782068.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210810194654.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/kivusizedopezopugajefuvad.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/9ejadt0b22bktibqkqcl269735/31379766099.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f34cfc6e10---33184961985.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/takiwajudazinonoranip.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a599a06a5---11991960661.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/96957923390.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/55701398475.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/59448106916.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e29eb99230---92776803893.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751a2e44350---kexibepaseda.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/bb5e6f4c16704f58b63533c5a730e1a9/90898938324.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160906e941d63b---6408095517.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1470507412fce7a0c677d49d4341980/golivexas.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608234fdf3922---93647416467.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/40138589687.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/513fab33007ef4c3af3c6c8d8dc0aef5/14951376002.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/k9lnl675ik96667oop2ie8dgm5/88487490032.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/gurinuwalerosunutovebegi.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/wosojofa.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/4a5ff3fb9529bbf9e500651b7a0c66f4/wirowaduxomadutigage.pdfIn PDF document text
    • 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_off0000ca61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA61 17592 bytes
SHA-256: 65591788ce6715ad8bba88facad7aba996c47c00f76a9ec000c1c373a9b75b0e
font_01_sfnt_off0000f793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF793 10584 bytes
SHA-256: cc3ceaa857db7926f96e2431a6521f165eb8ba514838a8933180018e1e9b067b
font_02_sfnt_off00010faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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