Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e715370df5b5ec8…

MALICIOUS

PDF

75.8 KB Created: 2021-09-17 15:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 92d9bb9570f7d606d61e59a403c20f53 SHA-1: a7e989a5446b7f86ff119cfa9ca2f2c371ffbe94 SHA-256: 8e715370df5b5ec8689096cef329f6bcc7a11102a7e5de3ae091e7d7e30a282f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. The heuristics indicate that the PDF acts as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49653693885.pdf In PDF document text
    • http://k-ookuma.com/js/upload/files/teluzizurifalizepav.pdfIn PDF document text
    • https://duvanco.be/docs/files/rufivobabesujimuzemone.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/sugokobuz.pdfIn PDF document text
    • https://medtek.vn/storage/file/94802086978.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/5965152538.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/017378ea59a00fa0e3bb810f29764d96/60994012766.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/mitebovagudumivugagob.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/wovaraf.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/64033a55d1c6fccc54a4ead3b41bdc92/26993487125.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/92809448575.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/69275635220.pdfIn PDF document text
    • http://coolscape.info/images/files/93686867232.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3590cab45---disolose.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434cf47f2b5---nuxatejojenef.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/raxirufadu.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/58979986006.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/dunamexofolufenesegeme.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/pofoxetoxalanozafofodor.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/50605820415.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-13/20210913165212958086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=rotation+controller+apkPDF 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_off0000c4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A2 17820 bytes
SHA-256: ffad0b9e5156b289bdc6b77b386caaa80d59e96572ca288549798f4e7150c7a5
font_01_sfnt_off0000f2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD0 10336 bytes
SHA-256: 04e96dfebd05f4884192fd578125f8d2342b5edd74ea1bcbf47974083293ea22

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