Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3eb05412c1ed107…

MALICIOUS

PDF

88.6 KB Created: 2021-08-10 03:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 197ba910f95ee8797b6e57e90fd3c259 SHA-1: 730d1109c223a4296d03ca0511381c9515d7d9fd SHA-256: b3eb05412c1ed107d20c0a329ccabf01da82d6f0d342cfeea955f3286e2ed3b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to drive traffic to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160839c576fb74---giluvefuti.pdf In PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160967d38ab9c1---76857251334.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607ffa39743da---kanopaxazowusikeriputevo.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/89334286427.pdfIn PDF document text
    • http://fxmeat.com/upload/file/c8d81172f37dd2d490649df9dba8c947.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/rubedunemepew.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/zebewizuzovukefemawodog.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/u0e2ou0n3satlq4965idoouuai/18887182041.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/wejono.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b3fff2ae7---5916165714.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/19387232171.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f1207ba6e---zujujasob.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/35196199704.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/kcd4checugnumsf2de59rdf864/geduzofixepajuniwuw.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca13c34ebb---88133215422.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///venagek.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b9810a785---84061119794.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbbfcee002---50692689759.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8c41cc79c---75452531027.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/95837070580.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/bomaponasevora.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a0a5ea65b16b044d61da3a35ecd73671/38173188361.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a910f25e719---49093683224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+reset+my+cpap+machinePDF 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_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F39 10784 bytes
SHA-256: 0dbfed9e27352c8325d88b27ef6b1f7c416a49a2646074aa4eb460c00e3f7306
font_02_sfnt_off000127fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FE 17104 bytes
SHA-256: 7f6d8119cffc10d428bbba88b4f151399e688ad0adfe461ef8395075d69e9436

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