Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bde9889a111a3e1…

MALICIOUS

PDF

91.3 KB Created: 2021-07-05 06:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a51e6e9c41b0d82482d3cf84cc235750 SHA-1: c5446ec2175d0fc0c8f1e8e13ea5f0cbc77f27d2 SHA-256: 2bde9889a111a3e1bc595f0965759117278590a71af7f28c0ad091dde46167e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristic firings suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/5fea1a2d71fe4c7046aea1c7eedbd328/7763890586.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/b28630d9ae0f3793b7a45e6742a845ec/50504495800.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/1aipdn86qef41g13l4v3pr7gk2/jomalanexizemuwowikimena.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/11370def51986fdaf52b06ed3fb5a11a/77984978758.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f54b302111f3629cbcbfac723fe45355/47618931580.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/09u9cotnmontr36qrhtbj7q1d2/30968054885.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e89b6073a---kopisi.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/d962d182ed80db85a88ddefcfe2ff895/zefow.pdf
    • http://bjjiffy.com/upload/kobofixojojogun.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b650e7d8fb---metagune.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1d0f6976cb97062ab9590f4799d60f49/11011272386.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0c451537e---jisomatokozovikase.pdf
    • https://motelandratecuci.ro/userfiles/file/15288668881.pdf
    • http://optykglowacki.pl/obrazki/files/25189596808.pdf
    • http://chinamakina.com/userfiles/file/zizuwegetexuxapisidereru.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/586d47487103e75d738eaec1ce7a08b1/10183717998.pdf
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/25248287527.pdf
    • https://chmelo.hu/sites/default/files/file/8867362616.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160792f24c964e---78584170732.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/hf229r2h9la0h67bu9h78529cm/powopipipegenamononix.pdf
    • http://worldprint.su/userfiles/file/64215280514.pdf
    • http://martom24.pl/martom/userfiles/file/mojejamowawirewub.pdf
    • http://kirilmazbardak.com/userfiles/file/ximurelunovuwipaz.pdf
    • http://imi.vc/upload/files/63589528965.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/f95f1959f3f5f95f9f1a954b768cd751/72938647911.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=suv+with+manual+transmission+2021
    • 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_off00010332.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10332 16792 bytes
font_01_sfnt_off00011b44.bin
f100babfd41b1b2a9860b6ed3f6be96837e6c940ecda0a23b081ef0a5989b61c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B44 16764 bytes
font_02_sfnt_off0001470a.bin
35343642409c35efde3e1ddd742102b387868de2a885e4e6de11a99e42d5cfaf
pdf-font-stream PDF embedded font (sfnt) at offset 0x1470A 10860 bytes