Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2892168762ea3cb…

MALICIOUS

PDF

83.9 KB Created: 2021-07-03 05:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eeee439f4b1e6080118ffb47153f469c SHA-1: e553c0fe1c68b0f842bb7960eaabaa72ccab841b SHA-256: c2892168762ea3cbdac29ac370d468ea07366ed739a3af6e6e8b3e4af5bbe292
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a T1566.001 (Spearphishing Attachment) attack pattern, aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a912640cba7---82783473044.pdf
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/wuvun.pdf
    • https://vgi-vn.vn/app/webroot/img/files/wefixojuxajazuboratos.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/18tu0ek93dabpfn1i2ah1rfcvc/18931430344.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/i4mkucl3p06aj9ajcdi5v75fo2/94708051916.pdf
    • https://wagaskar.com/media/sifakejawotolano.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160708ae17c8aa---pafazifuwulu.pdf
    • https://dijitalsanat.link/upload/files/rafebipexelaxinekages.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919e394716a---28036080761.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d01bef57e63---91572770214.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a936b140785---batoru.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3acaf9a93f---suvavisigef.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abce7020463---14890432587.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5d46bd020---vumupawiwusin.pdf
    • https://bustotoronto.com/userfiles/file/negojuxokebosuvalagiw.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848ade5c17e---nejojigob.pdf
    • http://ackerviewguesthouse.com/userfiles/file/99534976720.pdf
    • http://learnazia.com/fck/imagesfile/50089167670.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160859c60b1190---57027765732.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/1a6e29d390c1c146413903e35b2f71b6/10307701303.pdf
    • http://hitecds.com/userfiles/file/misibaxip.pdf
    • http://megalaserasia.com/upload///64280060518.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=1+litre+of+liquid+oxygen+to+gas
    • 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_off0000e2da.bin
9d92870b88821f0c11cf8cae45354b266c57873c377187149b901616b1f50590
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 10944 bytes
font_01_sfnt_off0000fbe2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE2 16792 bytes
font_02_sfnt_off000113f4.bin
3535291056d9117b50e78274edf0df4483ec446252fb0fc82a0e0e2dfed465a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x113F4 17852 bytes