Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f880420f814bb08…

MALICIOUS

PDF

89.5 KB Created: 2021-06-28 08:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c97bb95e4817defb6a420d830285a75 SHA-1: 9ff375dc85dd1905a9f1c91172b7920368a3a997 SHA-256: 3f880420f814bb08f8bbf7e00e24cf97e1cf1d3cfa79b406b181d4acfed81ed4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document's purpose is to distribute links to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://veraschwemmle.de/fckdata/file/vitesodusumixadu.pdf In PDF document text
    • https://ozmutludokum.com/userfiles/file/62909265630.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/50609334071.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3787ad1cdb---vovubejape.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c37f4d168---88075428291.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/likolel.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/9h3ndkmns95u1p2nkhm44pqd8r/85110668280.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb40d32d87---95806957633.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/vorarufi.pdfIn PDF document text
    • https://hgb.se/filer/file/32775689763.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609172279dcd4---nitoxonemazulenej.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/57638616274.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210528_155724.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd060d3d09---59358773456.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2925ab9d11---91989777573.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad010a2113d---65342428638.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210613_183532.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbb9ad21d5---39038940706.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/lcn3kukasidtgt5fv3mma00ks8/monidawomixisesani.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/10534983970.pdfIn PDF document text
    • http://groupkaishan.com/d/files/1251935788.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/733480681.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3810eb0482---jarapimopokajozubave.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/cpc2bp3sb94opsgm5fdmru2v15/ziludewiruvojo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd65e960aa---fulikop.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/0a71c45380bdf1c6214c0fb877a58417/pobalanivadumegemudazel.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/22457068064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=find+the+cost+of+levelling+the+ground+in+the+form+of+a+triangle+with+sides+40m+70m+and+90mPDF 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_off0000f49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49A 11568 bytes
SHA-256: ec2451eea245bfc5e7c94890e8a0970996651b2587f9d9584be5c98830de3584
font_01_sfnt_off00010fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E4 17720 bytes
SHA-256: fa9b4b448e8497667992194ced0e7c4adeefdec8c47c68d1d1e942550f42cd23

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