Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b322622359baf4f…

MALICIOUS

PDF

79.7 KB Created: 2021-07-25 10:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e7cf8645c7f32921b11cd66a83f3155 SHA-1: 6847c584d0a61a3b22d92729a5b638d0fd374161 SHA-256: 8b322622359baf4f589530888bb10619282bf9904ed9c53cec0a3e21fd2714e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed to appear legitimate, while 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests exploitation of WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/natagezisawebid.pdf In PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/46834311908.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/52533512372.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/76912420699.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/gesikugopofulugonaz.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d7734340d---buguxalisekuxeva.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/4842281594.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083812caa89c---woverumafudufup.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b48ffdcc1f---88887028335.pdfIn PDF document text
    • https://edbcagliari.it/file/sugubakazifowus.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/29525464822.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0edbb968f---weferifomirakezowu.pdfIn PDF document text
    • https://airbays.com/userfiles/file/93960100406.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/12858056679.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089beb4d1223---46420238524.pdfIn PDF document text
    • https://coevent.ru/upload/files/fibapikasonev.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/59070891522.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/32537385313.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/18903124892.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/judowarowom.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/86215389499.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/13735085189.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/6100ba4ca6d4c8b041af79498336f676/87780390860.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8ca6ab156---45113203445.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/skesjqbu1fun4aaebs06gchsqv/vazatepafonakafod.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/b7a176fa48aa00b3be66773259058d03/mebidiwudamipogiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=go+math+7th+grade+workbook+answersPDF 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_off0000d10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10C 17676 bytes
SHA-256: 951c839213e7c3aaeeb4a509a520bf241d92b98da4756e7331bc4d453d7dd981
font_01_sfnt_off0000ff3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3F 10964 bytes
SHA-256: 5d71d4c059a9df417530f5eed90992c0e2c4972d9169e2664b5e99d8658624b7
font_02_sfnt_off00011884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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