Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0dc596c6d55d930…

MALICIOUS

PDF

88.5 KB Created: 2021-07-23 13:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 01216db0a967d82d07e7fce3fd79183f SHA-1: 82b0a6387e055c39639fdd94a24e0945bdf33cef SHA-256: e0dc596c6d55d9301de9b82c157bb52c55673b52eb4577a8d46712dab337537c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites, suggesting an attempt to host and distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature. The primary attack vector appears to be a link farm designed to trick users into downloading a secondary malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a546549e11---gosex.pdf In PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ps74r6bpaqgk3j2m7ckj0nd3c3/lubazonaloke.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16091d66095b64---pisawunafanonabunobetes.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/53115875186.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/junijilikatej.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/wejubopotidogedale.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/51344234375.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/82715323392.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/86388530327.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9d1e4f33a4a9a70eb3d0da583c5014e2/pakataguxubozarivu.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/d75ff465df3da673dceb5a1be6826270/diliw.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/55576736199.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/10e20999427aa61de7e7a95e84e6731e/67949948143.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/1i5ptbi62j5iklmv0cvbbbt9o1/77759495592.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/61173249634.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/pp9bgcofish68p8qb7cir9hbu5/79137122589.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/0b22a66a4e397f0f916ec1eb10736294/worosug.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/79049788338.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/namatujaxo.pdfIn PDF document text
    • http://accronline.com/userfiles/file/71410200173.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/af7f2b1c91f6c0e316b7291a879c0add/11344323600.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/80342548433.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/13286735401.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1608a906f113b8---15632958485.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/q7lmmf3u0mri4qfrr8vr461mck/gutegeganisoxomovarifep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=calming+exercises+for+anxietyPDF 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_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 10928 bytes
SHA-256: 83ba66791a57bd47d2536a261c9c02949479955fc491bc06a47525991c377fab
font_01_sfnt_off00010fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB8 16988 bytes
SHA-256: 859ff965783ad498fdaaf8d10076f77d32ea596d321af53f1c3fadd5741c9091
font_02_sfnt_off00013bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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