Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb61cf8dc31b3a5…

MALICIOUS

PDF

81.4 KB Created: 2021-06-23 20:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ac918a0bbb63e6414c2b316cf8cd0e52 SHA-1: d5e218fc03a60ff9a943dc187bdf137e49dbb9ad SHA-256: edb61cf8dc31b3a55736ccce179e79e197dcbbf1c2d223c3877fa462fcc30383
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ad14ab4c6---badibulelujasumiwobexoxem.pdf In PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac07c9e72a1---mifagirisaxapekasili.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/29224640998.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/77ef3843462a3183f60f0b43f758b68d/rijexomof.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/a8kg81cniq7bso5a10kvrnpdv1/21663225969.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/e36897897c4ee997a39855db6a118e5a/25758607661.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab75a9c99cf---domufubugukisas.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/rudewupovavevolimuzoj.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/gibamanofupajuduf.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc6a4d7ad---vikexekamavufotenidaz.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607f68e88cf79---38369766636.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8638bcd67---58715249525.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/funebodexif.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/j0gr40jlk3jr6vltkrij6mgt83/97013085532.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/64060664562.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c048e6afecd---6575459129.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857b71a0221---vovolavaleramuko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=midnight+sun+trish+cook+book+pdfPDF 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE441 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off0000f435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF435 5384 bytes
SHA-256: 63198aed20a8719f083a2945fbe1901f975391136b21b963d2b2a0112aa53812
font_02_sfnt_off00010686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10686 2740 bytes
SHA-256: 65046aa6799bac693b073651da628c2af335d0e9d2f5bbd09e1e4a3de73d27e6
font_03_sfnt_off0001124d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124D 10924 bytes
SHA-256: f946551fc8db56faa8760fc13fb1bfb2fe8410375ad68225e4811257919bf4cf

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