Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad190579fc576b33…

MALICIOUS

PDF

93.7 KB Created: 2021-07-06 00:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 499063890c9da7c1a8d3b4aac4ad07c8 SHA-1: 521310f8c325426ab06149f750e2de7a2a8bc8e9 SHA-256: ad190579fc576b33c1dbd1b1ff79649df614739bb0a53e77c54f6680cb5960a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6859914ab9---roviler.pdf
    • https://aashianarealty.com/file/95104820802.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e8c592f55---35102875899.pdf
    • https://lionkingbali.com/uploads/file/purimufatabasusotakinaran.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd63251c1f---49768000858.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/149d8ad427274b593ba513e09337053c/11609705137.pdf
    • http://peaceinsrilanka.lk/userfiles/file/68055736100.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609def43d25cf---64742983392.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/22gfci2e7nc52is79ipea6icqp/tipukom.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/47913480661.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/hj5pt0rvsnved6505emk5jhsi9/59990688005.pdf
    • http://cartonwrappingmachine.com/userfiles/file/nizezig.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/c503af6a7e535c1a950754b4008243df/niguka.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d307b88b98---96651468494.pdf
    • http://aldo-ins.com/userfiles/file/putivofexomifaxo.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3469a07f04---rajerirusaguguxe.pdf
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/xozepipagoramos.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b3a1b2179---67051601366.pdf
    • http://telekommarketing.com/firme_data/files/11241040483.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4c2103216999a90b0c15cb14243a7924/68979278568.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/10ee9d8921ba12ee689fe71feea6f014/nifomokik.pdf
    • http://botosani.ro/img/uploads/file/40461697781.pdf
    • http://aucoindeshalles.fr/menu/file/mojemixavukoginagaso.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/c243cd92b8c33845f56544ab5edbe1e4/13782419547.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/4aedcf5994a5be044041d46948d54fee/sovufaw.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/4be57d544dd725fc7a3f6b95fde18936/kijuronakiwoxumedemig.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=two+point+crossover
    • 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_off000109f0.bin
ce47af24cff8b597f1b0022e293d9d5972cebfd6381adda2a05ce0a6a6550990		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F0 17692 bytes
font_01_sfnt_off0001386d.bin
11ac7afbec52882ff11cd7cbfb2ed29e35bb9dd0caf124cd044031f3c7ffcdce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1386D 10276 bytes
font_02_sfnt_off00014fcc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FCC 16792 bytes

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