Malicious PDF — malware analysis report

Static analysis result for SHA-256 9989d9f2a9c4583f…

MALICIOUS

PDF

94.9 KB Created: 2021-10-13 04:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d75a18f8cffa375a115e3cbed2283a44 SHA-1: f3dc2c172b72058ac422c59b2cd9d5732e26e01b SHA-256: 9989d9f2a9c4583fee9dab5e6e26e043c572383799d67796b5ba908b992dd919
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple external URLs, many of which are hosted on compromised CMS upload storage or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://audidalys.lt/ckfinder/userfiles/files/47797741237.pdf In PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57847857184.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16143a2c629f5f---nunebogogabi.pdfIn PDF document text
    • http://torgoborud.org/images/file/78934003084.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16155b6ee73468---8950773337.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/26440021753.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/midukubunigobulububa.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/8978603989.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/89774030638.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/79641671384.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/72191490096.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/dafusetipalegin.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/kenisuwabexagaputomaxis.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/nupuwoboxojavanis.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/64216279718.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/20925427910.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/moxononipisikazoxax.pdfIn PDF document text
    • http://irollee.com/userfiles/file/pefuzinunogifulawale.pdfIn PDF document text
    • http://3234.us/data/attachment/file/20965157499.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161521f73e29e7---zeneroxisobukow.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/91764686489.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/2484941233.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/rogenetutitaxuwojavipobi.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/19536868360.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/EqozwcbAC44/uplcv?utm_term=how+do+you+get+rid+of+mining+fatigue+in+minecraftPDF 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_off0001072a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072A 20028 bytes
SHA-256: bdb09936f20db43c269e26c5db795cad74c1c5a54520039a247e521730e43beb
font_01_sfnt_off00013bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF7 10896 bytes
SHA-256: 24c25fa25963a51b68a12b1671c82d060c74a5df9d999480c3d47653c4d7b4ca
font_02_sfnt_off00015500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1