Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab9df12b5ed04a3…

MALICIOUS

PDF

79.7 KB Created: 2021-09-20 23:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 391e0e66e832da4b460796c3353d3545 SHA-1: 33279c1b99c1fcbb119d0899539716e763a820c1 SHA-256: 8ab9df12b5ed04a3cac3dac8ec3e65bf0f20496e49d04ab4199ed00a9d19ea6f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, acting as a link farm to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of multiple compromised CMS upload links suggests an attempt to host malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=cider+emulator+apk+download PDF link annotation
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cc090245e---gemobepaduw.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/68d668cc2ccc3bb0d35678247b9be3d2/veranuwotisipogadajodoju.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/42334050086.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/83860543368.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/49789404975.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/654d0ea78a7e26aa39ad79a55c815322/fabukutofexogegulofe.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/11615849175.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/kibowilopagikulida.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/rukirije.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140114d107b9---33538688668.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/96092323662.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/29882567784.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/nojazejezosaj.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1e896cd56---nuvave.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/45254560335.pdfIn PDF document text
    • http://rhondachem.com/d/files/96421336693.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134e68b7931f---ketebi.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fc93b18ce---jugirumu.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/betumabatosere.pdfIn PDF document text
    • https://basisangka.com/contents/files/37537002717.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410de9c0c4a.pdfIn PDF document text
    • http://iltorg.ru/upload/file/kejufowogu.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/sewaveseledizitobo.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_off0000d2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FD 10692 bytes
SHA-256: 69cd543f0e273040b029762644cf5028d49769ddb22d5c1f20857ff2fe04f2a4
font_01_sfnt_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 17588 bytes
SHA-256: 0d0a662d79e01523abec20db5e2a97de221a474f5060726b82f7736a22b6f856
font_02_sfnt_off00011955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11955 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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