Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a2b27cf9653714…

MALICIOUS

PDF

100.9 KB Created: 2021-08-29 22:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e8e5c41972405df0c82100d7d7c7401a SHA-1: 16881448a35c922e4f1b6ff7cffae635b40fd7ff SHA-256: c5a2b27cf9653714f6e47c9d09d1c0ad7d24ade0af2f4f816354d6a3cbdc2699
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bbfd2e1b8---34738899606.pdf In PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/11541001840.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce11dc42478---nudumiwepewiza.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/72164361559.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dac2d65e25---vinorusopezerobew.pdfIn PDF document text
    • http://www.moyekolodin.com/files/kimozapidipijedovom.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/lisijapazinasejifo.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/67630981417.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161077b859cbcc---85878569096.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/93609847053.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160f81eed380cb---99151121522.pdfIn PDF document text
    • http://capableapp.com/uploads/files/tupixaxed.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/53236081236.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160db91d7cd3d7---8047225221.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/fuxobibefiremowiw.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202108272343128385.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/tixebavemaluginaw.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/17353791715.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/pisumagopugolidopiboka.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/kibuwuvifotawadutet.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/93341591114.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/74346701457.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/dfe8ff5ab0597069d16ae6316886e259/42027841224.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/78681674111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=new+prince+of+tennis+261+release+datePDF 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_off00011b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13346 11016 bytes
SHA-256: 3c09cb4dc44a7eb7fa1cc574ba8237066b570da796b083dc4b91659aa3a1c015
font_02_sfnt_off00014d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2D 21172 bytes
SHA-256: 43b4833b825cd3da6441b40c6369b1a4529724d1540ea93d902cc717f83fd15e