Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd27085d8e6e064f…

MALICIOUS

PDF

87.7 KB Created: 2021-06-28 19:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 32075f5addb658e490ef4c0a6d892ef2 SHA-1: 2afc39ce1b49da3bf9960ba4762f66ef939ac614 SHA-256: bd27085d8e6e064fd3bf8baee15c82c83b55ed20c1db2eeeab5fd3585e62995f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or trojan delivery. The primary attack pattern involves luring users through a malicious attachment to a network of compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cooperspick.com/files/mevivozapesavatefazexo.pdf In PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/b05ecfbf33800f31ee1d4a742203aad7/42883426489.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/p3u7mnpm81uk87dmputsigpsoe/65683560648.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e0694d4f111415d420dab20dbfa38932/57606693733.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927c101aae0---domesasili.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/7pn5jlpsgsnuk3ct9v9saofnmf/gagimavasifevut.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077dd56da80e---ligozazogaruj.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b3fe97f8db55b0c256d0b78d15975ca5/befowujebib.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d46d3a74df9248c3cfc652937767983/xalanukob.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8mf6ip9n48q1t235glc9uesp11/vewujezawewufeboxe.pdfIn PDF document text
    • http://honda-vo.com/upload/file/67852054781.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/98c6e09627b2e66105892b3ac42dda1a/45407908609.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cc0be59fb---sogogoweboxaketanesopawo.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/48389700260.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafba247f51---fijaraxojifupi.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce15b7b84e8---jegavanalukuvuje.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/vadomugapovubukaz.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/8refjivjcqj8b2c3josnhohedn/23571629139.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/kiid7f4ufvjirr6l3f7der91q5/vomepizavobetovoweki.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/regefalilaxazutumokimifo.pdfIn PDF document text
    • https://drlanda.hu/user/file/jabelanitaloxewujomumu.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/9827777169.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/dobuzimopatesilifogot.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/mevufinakedopegifevup.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/62204723793.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/djbja00f0qg904qapm4b1mf70m/vebijebewakuguw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+real+housewives+of+orange+county+tamraPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B31 11112 bytes
SHA-256: 4838cc77c91213ef648e66ca6d50d4bf0e0da976383a022bd69f5e1a34412d37
font_02_sfnt_off0001250e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250E 17036 bytes
SHA-256: d71625a982200ef5ed97e99921b7bc372ccddc256fb5982fbc0afe306814d0de