Malicious PDF — malware analysis report

Static analysis result for SHA-256 e281e41aeca37aab…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 11:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2040a24f60570b574db1cb6edf3ace3b SHA-1: 0fa16a8a5b00ee5e76be32a7f96b56013e0f5d40 SHA-256: e281e41aeca37aabce42dceeefcec85d2e800e3116bea7ff7dcbdee77208b056
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various domains, many of which are identified as link farms on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://lideregitimpaketleri.com/calisma2/files/uploads/24508696551.pdf In PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406c988cca0---lezibexilisorufesevel.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/71067658782.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/97328676151.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/wilidipe.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/lpieesb1glrhssvtbee8t8etrd/rerowukukapu.pdfIn PDF document text
    • https://unosms.us/userfiles/file/vubokilosipigamejazo.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/zuwosiwinoxidiwejus.pdfIn PDF document text
    • http://ijfbn.com/editor_up/22488745380.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/livujotelarevawik.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/rarofaze.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/menum.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/55052623896.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/jopadanaginezenuxamav.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/buvivitugifuni.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133a61b2130d---dumikagidipuv.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/24565851337.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/29087238013.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417db6eefb2---67394969234.pdfIn PDF document text
    • http://parfumland.sk/upl/16186238255.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/42519049871.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/8054348590.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/13226564114.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/dujerebegejilu.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/visemiwovufo.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/92332059265.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/pevogegelixuvesomux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=chakra+ui+react+nativePDF 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_off0000d8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B0 18300 bytes
SHA-256: a43f0b0167ec8f718415330a68a578d6f96dff061790242aefc2b841058cb15a
font_01_sfnt_off000108be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BE 10284 bytes
SHA-256: ad78698f055e7b9f74f5a892f1be32e32330c8bdaabacdb3c8a473b0ef03f63d
font_02_sfnt_off00011fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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