Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9113007b6c56d79…

MALICIOUS

PDF

121.8 KB Created: 2021-07-02 18:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d057a1080de25e695a08cc59fd97d7fc SHA-1: cfde82f5caa92ea4626f00886f3224213171404f SHA-256: b9113007b6c56d7912901490d6ba425db285d8c5a3e22e5e7e7f09cbe653c145
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9661

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://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160970667a59f5---fagewefagute.pdf In PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbaaa4347b---sesixiwajoziloke.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/21d8491db68d745cf2ce8149501b47cd/bomudobizixaxil.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/05329268fb6f3f5294c18940615a7d82/92941185714.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/56223051937.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cfd612b97---59106505706.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bb2346c43---15812139449.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ssqoda82a7eb0r18ega26jg323/xozigitinilepadetoxojotez.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f127e055fd---vufaz.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0787bac49---mosesojowerosidisid.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/wavulurapevewa.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ea932941f---voxifizoburivapu.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/2471c1e9b4e307254f20c35483724cea/lejuziwajerasutito.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/74224731805.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/a4a39765db8d14a038bd7c73b8300b2c/masetatakax.pdfIn PDF document text
    • http://zae.me/datafiles/file/57288285438.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/62396728938.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160db1fb7204a0---miposuxufivobara.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b7d1635f---95942278461.pdfIn PDF document text
    • http://4bx.pl/public/file/xawiwowivawexipeki.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///godokewisolel.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/meguzasiniz.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5efdcbaa7---gefobasuramibesise.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/gapubom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ideal+bmi+according+to+agePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000154cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154CF 3408 bytes
SHA-256: 461dc7d93a682042f7c9f340df4bd418354e6bbe587380d5a92a82d3b0298684
font_01_sfnt_off00016296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AAD 10636 bytes
SHA-256: 61df0538d7dffc6cfa276c23a032786c9cd4975277ae613ebc14dd0337dd1116
font_03_sfnt_off000192af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192AF 16084 bytes
SHA-256: d11bfa2b02c462a3f9075532ce7ec1132ca3691ccd6a850e0dcf0119a218c04c
font_04_sfnt_off0001a7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7E3 18300 bytes
SHA-256: 89453f1a85bee076d9438cdf082e3a5784924463f08be32d8c61789ebb44750f

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