Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b420936190b502…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 00:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99b0ff92e5126dfa753a8efdc069b12a SHA-1: 4a3e0174c1fa30c3dff23112660adff76d75b0c9 SHA-256: 30b420936190b502d984c252a736531e7cfe497949162f06afe06df81fbbc38c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=world+population+prospects+the+2018+revision+pdf
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/38795984855.pdf
    • https://soccerauquebec.com/userfiles/file/tivetegat.pdf
    • https://ratosatu.com/contents/files/27991641087.pdf
    • http://phaptangpgvn.net/app/webroot/upload/files/24183038324.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087869206ed8---kesumovusubuk.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a8c6bfae8af524c9402d8f8c5ba7d4c2/lizuluxoxe.pdf
    • http://guidesdugrandlarge.fr/images/import/file/nosiwununo.pdf
    • https://hitpoint.tw/userfiles/file/kodofokelotigosopibejak.pdf
    • https://dolcezzecaffe.it/file/36748074651.pdf
    • http://artpolinakuzina.ru/pict/file/nasaturavoj.pdf
    • https://alutat.com/data/file/32184799877.pdf
    • https://semagro-msw.ru/pics/images/file/41170598529.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4d92944d2---tavubuperepexor.pdf
    • http://innotec-industrie.be/userfiles/file/93247034056.pdf
    • http://tiklatakip.com/calisma2/files/uploads/renezadaradikem.pdf
    • http://www.ciesol.com/ckfinder/userfiles/files/99990639998.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/ovm12mcmbfn7ll8qeofbo1nfs1/20151233758.pdf
    • http://cissi.it/userfiles/files/bevekavafuro.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/hoviq7o3j57ah2k6efk99qrjjb/defojof.pdf
    • https://www.assofmt.org/ckfinder/userfiles/files/bivefubuno.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784c9d9a51a---44627378700.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d14a569e44a783fa90d75b4d6b2bfcbe/visulidoridinexu.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608792e21c0a3---komuvode.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdf6852b4b---dowularagonazevumovogam.pdf
    • http://korea-seals.com/ckfinder/userfiles/files/63912486844.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_off0000d910.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 16792 bytes
font_01_sfnt_off0000f122.bin
584bf75ee289d300698c27b769748f9e5f0bd21ec13e88d80e92635eaa093bbd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 17356 bytes
font_02_sfnt_off00011e55.bin
614e9b8fb358e9d9a62c8c15c5fc1ca09697c36ac555789fe5ab7872e2db7bd5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E55 11376 bytes