Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8b35a1e42d97ee…

MALICIOUS

PDF

83.0 KB Created: 2021-08-07 11:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aaf33432b8049e08206e1164eb59e19e SHA-1: 4d0a84a9d112e24a85b8d46c7ff420069c897101 SHA-256: 9b8b35a1e42d97ee80ed72ebdbd08a840b46ea5ef02ab041a95098888bf23fa4
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/67f7c5e2e92766528f3c8a24750f8f9a/27359383213.pdf In PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e0fa1ffb9---tijogefud.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/zisamirek.pdfIn PDF document text
    • http://eternaseguros.net/files/files/42192113875.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/c2e6f49c4b834975ee9f686dd1f30be7/54748580917.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/vetop.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/271858245898.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cb61a5a72---96810764015.pdfIn PDF document text
    • http://siembra.me/uploads/files/14608997894.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/88612396686.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/b0use3lcram6ub0r61j9usk3fo/3759115706.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/jiviwanuvipagapeperiv.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/30961742921.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdff7e85d7---vesinefokagusuxefovemavi.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a2350eb35---97183662140.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/neneminaxegixi.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/kinidejomawosote.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/87823613814.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fe7b2116e472eb481885d7553ab01f37/vamome.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/2211933360.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/74115205729.pdfIn PDF document text
    • http://hms31.ru/img/file/48734558133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=doctor+certificate+for+sick+leave+template+formPDF 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_off0000e2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 10696 bytes
SHA-256: b421a4c6804e94384caa88c7830f94b3aefeba8923a0d39bcf946da12b3a78a2
font_01_sfnt_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 16224 bytes
SHA-256: b26d6b9349bebacf4decc80d9fc256716ca09b73d052b9925292c495c4da98e8
font_02_sfnt_off00012524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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