Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c8e79e9d389f88…

MALICIOUS

PDF

87.5 KB Created: 2021-07-21 22:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dbc982b9ae59c7d48d37f5325bf27c25 SHA-1: f37a1c9ed2fc79fad3783d1600910dd02ad942c7 SHA-256: 08c8e79e9d389f88dfb23a0391a8c04f5bb8e2e2b465058cb9fa22f18cd9bb9c
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The heuristics indicate it contains a link farm pointing to compromised WordPress uploads and lures the user towards installing remote support tools, a common tactic for unsolicited technical support scams. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it may exploit vulnerabilities or lead to further malicious content, potentially involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e2238d3b4a7---jikaxuzifuvefif.pdf In PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/ba6a9798d722798dcb6114c9f521311c/73723329647.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/43692164572.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160be542a5d8d7---2367876621.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/kikugidotebetikusukores.pdfIn PDF document text
    • https://hoalavender.net/upload/files/jekutogomifulakexetorovon.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///43761352922.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/v6uak48ujbigiofcecf9vfi014/tukibukif.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/37902819175.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/d19a6c2ded7f30f15dec2bef6d34a1cc/solajor.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/xeluxuvilolit.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/5sq7brvrbtc927jg6f6s14iqq4/xazevepebemebudow.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160804002964fe---15809765974.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57570627759.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/78357770498.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/xipizovefagurofof.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/fidiweneterukunawewax.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe7aa306ea---tikekepisikawasudigi.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc86656ca0---pubegen.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/lc8dlnf8govqk9hdemmgr0ti11/zewidufo.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9b49973ec---pujakite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+install+xapk+on+androidPDF 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_off0000f2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B4 17276 bytes
SHA-256: 3727af9df062d7157fc12aab4511fb9a6451a0e0f4d750bd5ba9e79fc3a9d105
font_01_sfnt_off00011fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E0 10524 bytes
SHA-256: b2629d6efe3d65b67c23c8bff231a45025a74c93109ac84d5f74107934eb1943

Open this report in the interactive analyzer, or submit your own file for analysis.