Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41af5fae1d02975…

MALICIOUS

PDF

84.9 KB Created: 2021-09-07 17:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 677c25148b5f4d21bb66a3bf48152c6f SHA-1: aebf1b5e42cb7c29412326566b2b942b0dc2f41e SHA-256: f41af5fae1d029753f726308a032900570a81c8047e7752308154b15ef5a8b21
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript and a large number of external URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://wastran.ru/uplcv?utm_term=dynamical+systems+clark+robinson+pdf PDF link annotation
    • http://automsystem.com/UploadFile/file/20210505201751932.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a468b03a7---nipinizifusinigivigara.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/sipiwujitojexir.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f87b6a166d8---dazutepazuderemajetof.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e73ea619b---85884950566.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/c1j3mulvnujc2nik81ip2q4p41/gaxokezemilutafitup.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ts9mtr9r5onnmovm3h3gooh62i/zadawat.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/duxezopetofekusi.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/metaporubosofosaxox.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740565a6762---8082520875.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/75867886378.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/52e78ce3da8a5af2fac27c6e400d527a/saxuwulalediji.pdfIn PDF document text
    • https://mnlex.it/file/26752548774.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/19792032333.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/tovisujililux.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/90040801984.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/zurejopisira.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160878328d4ffd---sixunazekuzuzigeduwo.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/37612389707.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/s6viag2tqh77nhq212sodthak0/90743464850.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/domiwovulefixakiwetogukev.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/renevutofakisuzetazosisu.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_off0000e1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C6 11128 bytes
SHA-256: dcf240063903ee81972318431e640f5f8ea082b9fb5869329fc505485c6f924e
font_02_sfnt_off0001138b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138B 19244 bytes
SHA-256: 8cbc87c4f3e822d878bb0fb9178db0d6a2fae554fe2301cbb30e34c27cf0d3cf

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