Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d4c849ef2c10dd…

MALICIOUS

PDF

87.0 KB Created: 2021-07-13 15:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a3508141c42ae21b2e9f751657b3456 SHA-1: 8d98f00a8717e4005258de443a75d6e54361bc02 SHA-256: b3d4c849ef2c10dddac7f3840682fa52a1c8b80dd8f3aad64754c97e80bea946
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://inwebjor.ru/uplcv?utm_term=rational+numbers+crossword+puzzle+with+answers PDF link annotation
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0f5c21ce9---52010897353.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/watikiwusufi.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/90244400752.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/lepifuzisonanopax.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/68156839064.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f7c978716---dojemonima.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/48193201446.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/m3bo3uompfsj0sgjfookn3l34u/migexuxo.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079b90725678---30663676394.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/makokojexuniwafemigem.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/5d4deb08bd3f3cee8e7edbe9bf91baf6/40657746961.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021060117174273499.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/15842862361.pdfIn PDF document text
    • http://nfc.soo.jp/file/89553812984.pdfIn PDF document text
    • http://www.asslar.de/downloads/11985403364.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858130eb9b7---fosulotuba.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///netunokozidowekefirudisir.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/elc0cjqq7iu98flnaap2kmu48f/pezonemejunakokigere.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/44008125394.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/68104464876.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/potixuxeg.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/fevesotabimo.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/redotutatirudo.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_off0000ef90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 17204 bytes
SHA-256: 6477ca94c7f666caa447d6839ee5b5ab14760417f40703deaeee593e6ecba8e4
font_01_sfnt_off00011c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C72 11208 bytes
SHA-256: 01a59d7f01d2b675f106061d7df1408c2747c778b6dfec1ecd7a55a386b81258
font_02_sfnt_off00013663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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