Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba12f5442d021a0…

MALICIOUS

PDF

77.7 KB Created: 2021-08-04 06:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0a4e0142a1867e5dba9d9c7c4f7e106e SHA-1: 4c2ad9ff142163d80f7c23d25bab7948a9511c8f SHA-256: 4ba12f5442d021a0ffed9c6248c3d27e6af51de8724ba888a219ea8772863d2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and link farm structure are the primary indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://ketchas.ru/uplcv?utm_term=general+microbiology+by+powar+and+daginawala+pdf+download PDF link annotation
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/92275269672.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/cb920ba0a44e2af3d9f531a523cd067a/81749547043.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/xigunegupa.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/4a1fab1108921aa995fa9b8425ad6493/30912655084.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/79118926571.pdfIn PDF document text
    • http://tuzlakart.com/files/92876089118.pdfIn PDF document text
    • http://vodnik48.ru/content/file/31452256882.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/tabukiwukojapi.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/doberazagile.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/75722520811.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd98000904d---73284883712.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/turigunegatuvo.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609411eeab7c0---49203217744.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/rosegi.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/56538404030.pdfIn PDF document text
    • http://24cvety.ru/upload/files/56399808928.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/nolifavag.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/6dgcscg1u5eipflvi12jr4qkvo/41080240056.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/678f486baf43d11caf05a51c692d6a41/95909548085.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/084d393553a5b024e418eb906a3b83cc/matotafas.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/nodatarariwirobokip.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e77dcc52b---60216644663.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e5b628507---fejalaboja.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff12c471f1---xubivazezuluxipinegekugik.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_off0000cc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC77 11076 bytes
SHA-256: 0504c5a8bb17729f94e5a75ccc16d3b45e4b6ee3a29bbcaaaaf8354c5996bfd7
font_01_sfnt_off0000e5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 16500 bytes
SHA-256: 89c91e8731e4162b99edd7634ceb8c5c00f7189063efbb9cad997a8c36b5c2ae
font_02_sfnt_off0001102f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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