Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f193bfd16631372…

MALICIOUS

PDF

85.9 KB Created: 2021-07-04 10:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c94c0f1fd206d070319a1ca171e0351c SHA-1: 44c65be4de787731804e0b16afba0e201fcbc2a3 SHA-256: 5f193bfd16631372d196b6b62f529c27bd3f5432ef5123d994d04f4556d70fac
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, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b296553912b---2389147568.pdf In PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/54641886232.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/2f62fd2155c4a83b6351c30624d32335/62721689971.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/gogilizoxatijulizumumikub.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceaf3534bb---zagatugobefego.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d81f4692a---84998954569.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/gadamajokaxevetavo.pdfIn PDF document text
    • http://hilltopperalumni.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/9937605412.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c238332a1b---91583565172.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210612_412CB8E155419470.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b7ba97523---gisurevimoxefokuboseje.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/73883140263.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/77507252592.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/gekekisaralepojob.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/0ced8b696e92767c93b93bae0d6b5ccb/vowovorasa.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081da3898684---46085276085.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c0ca41dfe---juvefamakaragigub.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc585653e0---vigadotekepemoguba.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/vizuwomexedasu.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/terapotofidefupewenilaful.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/10136500858.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f45efcb34b---45110629043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=worst+character+in+brawlhallaPDF 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_off0000ed00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED00 16748 bytes
SHA-256: b89a9a529e7b85af04aeed6b48c61535462fe645407fb3dba0565b0a7f25fd61
font_01_sfnt_off000118bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BD 10548 bytes
SHA-256: f718d0e4da2a5e5f3e672e1235b91aadce57f0c28cf08c3d141b93e90c7b5dda
font_02_sfnt_off000130d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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