Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c236c135f4c738d…

MALICIOUS

PDF

86.5 KB Created: 2021-08-20 04:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9622a5232ac0766be62617394812ccaa SHA-1: f0fd5119f98d5dee86d26d8dac07c62781f00d38 SHA-256: 7c236c135f4c738df64a0d8189d89cc588649166d8d88d79545ef686dceebaf9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37b7ef3bd8---nipisubeforo.pdf In PDF document text
    • http://bogieclassof67.com/clients/71235/File/wixigurukaxodarimekapagos.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e454ced10---vukuro.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/vmqfl7ukmk980vib4v5b822t02/4092473719.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/g4n4g92nq6hd0edc91qhn9qih5/vofevozerijef.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/12903064945.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/g6isnc8hs3qu91bofvmf16k2fq/jazopodariwanozafak.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/19554690576.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210612124600.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/28251504135.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/98285383869.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/191b5ea107f127a8d0e4f0264f475a5c/winubesufex.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609baf589eeca---memepefuluninubenesofixot.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/mimawamaxivapapit.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160909cdba84a3---minexosokaferovix.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/bfac92dcf0b42fdcaa4131003a723ef8/kefesinagono.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/fuwimobidumiwodiwajor.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c063b06f5---68532055047.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/9507489234.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16094652c62a0a---39553911551.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/wazex.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/rudubaviwuzuvadat.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/9d4cd0752e24d525c2422feaf33db42d/xosegututefawukapavera.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/83132015469.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/26312730808.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/hbnte8k8i48sjfucr34dvi9fvv/luxaminafefuliwadaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+use+magic+butter+decarb+boxPDF 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_off0000eb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB44 17188 bytes
SHA-256: 8db994f3acf88e5be1edc2a094ca6ae2f84d8969106ba58505ff7f5c00afdeb2
font_01_sfnt_off000117c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C2 10984 bytes
SHA-256: f485eee807f42fec9c732ff0c3d655bad93faf3ae699d5e9c9c73cc2270d0656
font_02_sfnt_off0001312c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1