Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3f4380544b541d…

MALICIOUS

PDF

87.1 KB Created: 2021-07-09 20:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf11193486bae8d52960b7096a9ff1e8 SHA-1: 1b6a1f8be18fbe5b1cdf3ee8d1f5292badaee170 SHA-256: 6a3f4380544b541d64e9e5e84515226d16a19749c766599b4dcddf61f8377f80
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://wastran.ru/uplcv?utm_term=cookie+dough+donut
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7ab876fcd---meligojiwef.pdf
    • http://duda-tech.pl/dudatech/upload/file/67840642006.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2c13e7ae9bc68db8d16b260fd11f6016/59909046314.pdf
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/4422696559.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37ec5e2f2a---kugus.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/bea3197cf99811aa1cc95555499ffbdc/sevaluvirumewifubodo.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ec6eb74eb---lemifixuje.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/9ce09c49ec4d8510456813b7f97e6875/wakilulisino.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/82737880e4413d5b7ec2828c27a67ad5/61336272835.pdf
    • http://closehorses.com/userfiles/file/gadavew.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/85d17c1ff1124cb2e67f7e7bbe6221d8/jugexelekogekubanedomo.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/14oa0onhtaki8grshnodh4ar85/1045999585.pdf
    • https://kovosluzba-praha.cz/res/file/rolekofubuladomul.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/wewovozukawomimizi.pdf
    • http://beming.com/ressource/site-image/files/46471138378.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce34d11ed1---pafegugokenibasagomizad.pdf
    • http://ankaser.com/userfiles/file/nupetupupojos.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/3ecbbd111681fc9ad6f86b87a07a2196/53896095.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/0071078b81e91db5abc620a8231ac0f4/fubobofenope.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/cbqhpmmjooact3unqinsv4rur2/fitonixuwetojavasopimup.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c91667d59---gemunowotagadowowaweref.pdf
    • https://muratay.nl/userfiles/file/14915478377.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/51220275897.pdf
    • http://moda-minulosti.cz/docs/momin/file/kijonizutuninuduxe.pdf
    • 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_off0000f168.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 16792 bytes
font_01_sfnt_off0001097a.bin
e9782b8fc617403197e338c47967853bf0c5bbc927c71520cddc6ea61865f5d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1097A 17760 bytes
font_02_sfnt_off00013870.bin
ca5fe6055e643a11e1deb03e1c6fd1a464c8a7823e33e200db7a74a7b57be1fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x13870 10272 bytes