Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ccbb596c82f581b…

MALICIOUS

PDF

87.8 KB Created: 2021-06-29 23:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26320135aa6c08761dd3d767a6732b3b SHA-1: cd96b05ecbac0bb0cd761dfaff8d0ea44e206513 SHA-256: 8ccbb596c82f581b28ce71b1c6b5a9e6276f32eb4211561e67064e54cb84ec7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to multiple compromised websites and potentially malicious PDF files hosted on them. The presence of numerous external URIs and link farms on disposable or compromised hosting suggests an attempt to obscure the ultimate destination and evade detection.

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 https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/qf9noiedkore337fc3kcf06152/26058611161.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/7d9ddca156e9a5e47a6892ab16de8890/kuwugamijuzatumumujed.pdf
    • https://isosklo.cz./uploads/93252211461.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b39913018e6---bojubojoso.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/23b8bf08645b6513c326c146b47df106/27800146832.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/ziperadalazenovuzagif.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/fcbqqoo0afnedgg8ro9ced9boh/43740818711.pdf
    • https://china-glass-mosaic.com/userfiles/files/20210607_202924.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/2208d20e7ea114b232c1a84b8aefbb77/40618102121.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/2503c4e356473b5cc3dcf531c0cee59f/1878370939.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/37ad2886d293fe2b79d7b755ea7dc66b/58198375662.pdf
    • http://mhinflatable.com/upload/file/86256264512.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e369c2d765a349fe6c060214b8380c31/3934750463.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b6529bef0cbb648618e1386241a8a9a2/71389320946.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23432187f7---11704688822.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/ea42b70449d0bb30c333471d6ae29f41/68211928166.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/e728fe512100b7b1c35905953f542600/fimagosoz.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/688535c81d8371ecd8ebe5c7fb300e78/pabirejegawagitis.pdf
    • http://pantryscan.com/123cars/imagefck/file/7441308235.pdf
    • http://jdhs77.com/clients/58520/File/redanefapovozosawigomusuv.pdf
    • http://atya.eu/files/file/vibikabesagapim.pdf
    • http://rosesrealtyhomes.com/userfiles/files/sogegowesilinofujageligeb.pdf
    • http://originalcheck.it/public/img_admin/file///77885022227.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/32a744d8bbadf2afd38534f5b2632bda/pezaju.pdf
    • https://betalinktech.com/blmedia/file/xorozupuv.pdf
    • http://armanetti.com/images/kikikutitomidenoxifuvevaj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=schizophrenia+is+associated+with+an+excess+of+receptors+for
    • 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_off0000efdf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDF 16792 bytes
font_01_sfnt_off000107f6.bin
96f3b4a17e2038a6299f2aa99487f2f0330e3fb8b530fee8407c7a11ae940731
pdf-font-stream PDF embedded font (sfnt) at offset 0x107F6 10992 bytes
font_02_sfnt_off0001218f.bin
ddb9e358e81e01ccd50a6b161aa0a8da426ef7e01801035f7e156f32fb2ea78a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1218F 18428 bytes