Malicious PDF — malware analysis report

Static analysis result for SHA-256 924acf8b4f1f994c…

MALICIOUS

PDF

92.9 KB Created: 2021-07-23 05:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ab019b687e7ab892d26a7fbd853ea66a SHA-1: e1eac297e188f0ce2240e8cbaa9ad54e8c7fee95 SHA-256: 924acf8b4f1f994c3c51e0399ff01b1bddf386d5cfc3c21d590a94ac120c12a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various domains, many of which appear to be disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination or to leverage search engine optimization for malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://bright-mineral.com/uploadfile/file/2021052503085488.pdf In PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fb8a22a7b---kovaromim.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/teduza.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/78a7d4cecc0274b68e40389f2668b135/retagisetowunosoku.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/22524142190.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ddaf79b2e2eb74c4a3d5371baa65daf4/vilopapemamimekonesirolud.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/d7342a15ec2dfd904cb317c06180f622/vanisaf.pdfIn PDF document text
    • http://bptramptour.pl/files/file/modiled.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/85713998358.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/dusofuzemokima.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/bad7ff34b85969b7dcd1f695b4d68a1c/17281465616.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/fuwitox.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/taxefijamovilupituzazad.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/24330521657.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1246a58064346ea9b7c8a3b18471a97e/mapugazumipisavelidenob.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/demid.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eb584e8a5---59399856339.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/rokip.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/suxixux.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780745a4527---dadilenifatexobokudowezo.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/wotowiwinoge.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081bbcf86d80---58100134499.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcb9a65e23---biwowivu.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/4443387932.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/2828654875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=out+of+africa+denysPDF 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_off00010578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10578 10664 bytes
SHA-256: 0f23917c1508573e741de4a87ac6bd2b47d45fb254720f5edabcd34cd1dcde14
font_01_sfnt_off00011e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E17 18008 bytes
SHA-256: 8d23e6afc1bbe0dd4c1dd5e2db87c08f61b8e25a29293bb10cfdd6df6002ec9f
font_02_sfnt_off00014d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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