Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b83d975d389f21e…

MALICIOUS

PDF

92.2 KB Created: 2021-08-16 04:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e181c229b954331ddfa84dce2dceddb3 SHA-1: 26f6e480b34ae8d58a54f8629813cce2aa9523a4 SHA-256: 6b83d975d389f21ea1ec3597c5465d0adff05acb19fa75f78ce128c3da4c3f22
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://alphabodysupplements.com/newerac2c/userfiles/file/55282140393.pdf In PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/e30521e13770058a05ad6869c0f5980e/tuminolonuroxob.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/86945869880.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/46331571978.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/vt8pb7kv0ra2dtd1kgp3vkr7b3/gefudefadulodijogegi.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/fotarovukomid.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/20094800336.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/65517646081.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/49244142460fa088e483f8.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/27959508358.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/12471969294.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/14091066864.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/83495501796.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6074b108f3---25281244390.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0e9f9ab26---31857171327.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/kumisasilok.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/4874496e2124be3fb93f847f58c5da7d/boxevanibuzo.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/lanoxud.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bca52cfc8---43750007465.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609679133beff---42192847788.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b30f3541f95---newebexizajoru.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/b5tvm63jujhi918ct40ai7cob6/70258241778.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab39e4538ac---68375206718.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/hvdeohk0u2o5dl0eomboq86l9s/61101528681.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/761sr3ir8lv0nl2plq5099fuu2/47564753205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=adding+subtracting+multiplying+and+dividing+radicals+worksheet+with+answersPDF 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_off0000fd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 11540 bytes
SHA-256: 59a91c10577eaecb92fc7feffe75005626250f2be427b9e1128ee0830816606a
font_01_sfnt_off0001181e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181E 19468 bytes
SHA-256: b6dac7203d484125ad782abfb2d456226538a637578977eea940bb8870b2c825
font_02_sfnt_off00014a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1