Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d6657e031b8b0b…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 02:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 54ac236be072a83e18d15d7c6634d660 SHA-1: af9abd02654afcfe1afb3c375240dc84d574c2dd SHA-256: 63d6657e031b8b0b8b383ec5dc2f4e4d0640222a85d218e7b57e15c8d5e15a3d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, suggesting it is designed to lead users to malicious sites. The presence of multiple PDF link farm heuristics further supports this, indicating a strategy to distribute or host malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://oniceh.ru/uplcv?utm_term=snooker+for+android PDF link annotation
    • http://hrudolf.com/userfiles/xevel.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///11658155125.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/4481842379.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/sixisiri.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/zoxinepulazujovumi.pdfIn PDF document text
    • http://notarius.jurist-info.ru/uploads/news/fckeditor/file/88409573961.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/78963774945.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9b251fda6---23771243589.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/85950118674.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/dovor.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/11279357249.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/69695794914.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/29020424158.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/93316357040.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136d43dbe20b---vatejefif.pdfIn PDF document text
    • http://thevale.us/userimages/13985101218.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/wipuwonujijedomat.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/77291037704.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/4176914257.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7578c10c4824e6b106ca17fba346ef0d/16338684434.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/33925673712.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/nigobixe.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/5c7e0cf0f2eec9c77592ab82a51af5e1/tudexikogukosetijiki.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/91251508591.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A4 10204 bytes
SHA-256: f49c6ad17a34ace0f4add253415ab8dd79078d92da4614867c3c9a3df01ba86a
font_01_sfnt_off0000df9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9A 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8
font_02_sfnt_off0000e84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84D 21612 bytes
SHA-256: 60c2a348b4651b2ac0598641069f7e02dc8fe1f0bd248f95131c9f381ee6d487
font_03_sfnt_off00011ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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