Malicious PDF — malware analysis report

Static analysis result for SHA-256 49744dd3849041c5…

MALICIOUS

PDF

82.5 KB Created: 2021-07-26 07:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 345aefc0c42c54a61407f5c9b9f2a3f0 SHA-1: 02455dc115fec81f454c5d3d89f8cba4a00c1977 SHA-256: 49744dd3849041c5abb899faaa5845afd2c3f94e334459e90fe74707d9adf30f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://boldino-hotel.com/ckfinder/userfiles/files/ruwoposegajegeg.pdf In PDF document text
    • http://hotstamping.pl/files/file/vefobazirekenaxajerenab.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210717_001136.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/noripadegubizev.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077c19faeb2d---borog.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946c0ce25fd---35649625833.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/77852998674.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/e33fadd9c58c0ba76bdd5271cfbcd610/37079753429.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fe690644c---xejofuxikinukomedikitubud.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/29588009943.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/92eb9723e01baa4145954e83daff92b5/11786959546.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9834c303c---jutumokigepulugodok.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/67473073529.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8d4481176---6852243893.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/f3e766f4c0a2bfead11903e01582fcc5/63470285894.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/8mmuqqpl57odb5mfq0v17mnnjh/81986384859.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/sesetakinotofimogolu.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/tapojobesigurabasase.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/376284965.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e63f147b69c---12479130493.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/chlmn2emmrho57f4htfnvqeds3/74004611106.pdfIn PDF document text
    • https://ultralloy.net/upload/files/jizesififib.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aa7d92ec4---ximinexexamera.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/29330525329.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210702162524508312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+write+a+reference+letter+as+a+landlordPDF 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_off0000e051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE051 16144 bytes
SHA-256: ea9cfe9840c6b86f4bc4e7d847463d4a66e0cbdce326b9cf91a5b856ddbcc485
font_01_sfnt_off000109bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BF 10548 bytes
SHA-256: 04ee3f9fe8f9a3b3007c25583dc89d2181587210a8b565b93d96df9544eb88b3
font_02_sfnt_off000121ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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