Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4ebbf2772c89ef…

MALICIOUS

PDF

90.4 KB Created: 2021-09-23 08:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e9fe8acc6c24b63a301dde397d3c6e17 SHA-1: 3a2961a100befab137a109de387a0261db6b4585 SHA-256: fb4ebbf2772c89efd275c8c5a6242920a0a79e6775aa4cfd69547b4fa2e15a5e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links. Several heuristics indicate that these links are part of a link farm, with some pointing to compromised CMS upload storage. The embedded JavaScript and the nature of the links suggest the PDF is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://anaksemut.com/contents/files/89309046476.pdf In PDF document text
    • http://af.ssla.ru/images/fornews/files/75892883816.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/38cb611f7933e94cd4047acec5342955/56010106410.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/32961508964.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/81079535640.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/kuniwixad.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/66140641086.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/jc4djnoqm8ug4ar9ue2bl79s82/52571654210.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/o9bcdennu77cuuc0h9qq3le6s7/dijolarutud.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16139f64530c5b---9613799606.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/nikoruwudo.pdfIn PDF document text
    • http://ladna.pl/user_images/file/85717722561.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/sivituguzalowulonilij.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/396a6fd800f221f7db9bfa1b40d2728e/19569493155.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/nixewesalegiwasuvemafeviz.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/86406783100.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/25422087723.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d414f35d4a---kodusu.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/94502074686.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/pirafaradotux.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/60812828788.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/valadusinigibuku.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/tofuguwori.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210906_52E9937EBCB641EC.pdfIn PDF document text
    • http://irollee.com/userfiles/file/37528880583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=law+of+contract+by+avtar+singh+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 11084 bytes
SHA-256: 0b6c63d1d5aaceb9b12c0254720e06d4d6cfc35434c1780ad564d62cf951d929
font_02_sfnt_off000115b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B3 17660 bytes
SHA-256: 0674c6411d945a791997d982166f50e2bde164770b20b69fbd8d759284bad70e
font_03_sfnt_off0001309d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309D 16416 bytes
SHA-256: d11bcb0e4828526933504823023447164228bb1776c6711fd1930d62d7ba7055

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