Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7365bffe232891e…

MALICIOUS

PDF

87.2 KB Created: 2021-09-19 13:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f6d05a02485023baf9ba808a035831f SHA-1: 917fb3ecb72c2d72ff10c3d0ae9c064498d76b54 SHA-256: d7365bffe232891eedd1d635e349e203f1898671eabcf765642721c79c2f73b1
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 delivering malicious content. The PDF also contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or link-farming lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ulv-fogger.es/d/files/mupakowutim.pdf In PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/91131555360.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/3f8c950535e90e4918fb4b6c75bf3787/39321940340.pdfIn PDF document text
    • http://firegallery.ru/img/upload/nebubibixedarojib.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/61766368841.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/lkod56q4h16m48k34jg97fuuq1/76914575874.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141bd611e0b6---27477077701.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/vojututoxadaloxafilivama.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/48303767576.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/jivopunulunirupezefij.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/28849112448.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/161378e305ea54---25685727764.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/7882961878.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/65507881156.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/dumogavokewinatodijinin.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16140fdf531100---lazijidowimibekokafexu.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/96526092694.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/sagewovibupojebodivemejal.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/h9ff6v9sjq5dkks3pv78trpual/2568534718.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/60946758691.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161407af223002---navapuzike.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/481452038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+boost+your+ram+on+androidPDF 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_off0000ef50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10762 18328 bytes
SHA-256: b9c7e8d10eeac2ee0296513498152af999e2cb90e42409de2842e011a75d0ee5
font_02_sfnt_off000136b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B9 10664 bytes
SHA-256: 2ea425e8a2940f32310fc94cb82a1a9f7115930daa32e63d9cb871830b4fff01

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