Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9a99518522df5a…

MALICIOUS

PDF

78.1 KB Created: 2021-09-18 16:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8a0ca02dc5c786ed084a3253cf6a3f1 SHA-1: a95d3dc382524b6e11af39ded75ad28923d71248 SHA-256: 5b9a99518522df5a00852cb05287b1badf977c52f717ab6106fdc6520b5c2fc6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/74651846514.pdf
    • https://ra7a7p-h3ba7.com/contents/files/libonepozetisotide.pdf
    • https://art4you.sk/editor_uploads/system/files/mimepidomoforamaruxigiju.pdf
    • http://xingyeknitting.com/userfiles/files/xikikaximajopuk.pdf
    • https://cordovajewelry.com/images/file/bomedanivuwimiwo.pdf
    • https://reaga.net/js/ckfinder/userfiles/files/bilijupuzor.pdf
    • https://nanyangtextile.com/userfiles/file/mugel.pdf
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/logexebodidimugalagaji.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141840610fb5---4534215857.pdf
    • http://datavincity.com/uploads/ckfinder/files/xibaxidofolivigovaja.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b657e8b018---20406524168.pdf
    • https://sibois.eu/userfiles/file/83555207908.pdf
    • https://studiecarriere.it/uploads/file/86085459404.pdf
    • https://psfund.org/public/uploads/files/cms_files/49980824126.pdf
    • https://nuttydog.hu/ckfinder/userfiles/files/10890951788.pdf
    • http://stelmart.ru/userfiles/file/rifakotesukufukalaxomige.pdf
    • http://mebel-moscow.com/content/xuploadimages/file/tipuledoboxowozojazusom.pdf
    • http://mestav.sk/uploaded_images/file/lisefit.pdf
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/vidog.pdf
    • http://scandinavia-ex.com/images/blog/file/kebised.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/0aa77a57c818797b4bab8bed5ca5423d/36579226191.pdf
    • https://www.babetravelling.com/ckfinder/userfiles2/files/pomuwowazobopako.pdf
    • http://printrun.nl/userfiles/files/fatagit.pdf
    • http://istvietnam.com/rich_editor/file/xususuxuluxoxagarad.pdf
    • http://rhondachem.com/d/files/fupodisamakawisamiguxo.pdf
    • http://thucancakoihikari.com/luutru/files/39380023977.pdf
    • https://corpus.bg/files/fck/file/giwiruferagapegunozodej.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=petrolhead+hack+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c375.bin
0e17db0e751ef02498a8a23d6ede7b08058b8d76a233b91da69823236068be7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC375 10340 bytes
font_01_sfnt_off0000daf4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF4 16792 bytes
font_02_sfnt_off0000f306.bin
3e00385add1f16295292105f813ba71f53b70d0bc4b2e01b03368b22447deef5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF306 21360 bytes