Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8eed497d33c7ea…

MALICIOUS

PDF

89.1 KB Created: 2021-09-16 20:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 212dae1f5e0162a8b6c534197e34dcee SHA-1: 90b92b62334c75f4c71bf8bf2f790ae37864e91d SHA-256: ab8eed497d33c7eaf733a4ef8b1496d435e92205b50fd863eaa24e9ffd583958
156 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373073e1862---15659123644.pdf In PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/16933867596142016a0feab.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/nizigavason.pdfIn PDF document text
    • https://bor-diing.com/upload/files/32597765224.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/89270772982.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161328362135c2---fokerelurifofa.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ceef33711e---82593862554.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/426a20701833ea14c9e5bb6e3a66d9ae/mogutadopewalipofi.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/32725706677.pdfIn PDF document text
    • http://bronia.org/userfiles/file/56955309636.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133a9c9379d5---78554853325.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/81995458890.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/23006039886.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/kumuwetibof.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/i9kj6t3pb82iij2a7bngb1mds7/ramuzuperidinirif.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210912073502_tlu3re.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/45589935526.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/5g0j8o8hbqclr8sa50q08pm5oi/najigos.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/gutikarojimataveli.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/tusole.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133fb39912ef---kebawap.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/87466904198.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/99325961165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=one+piece+stampede+movie+watch+freePDF 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_off0000f807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF807 11016 bytes
SHA-256: cf972365d9ecea923a7441e91fe75d265c67a4b995d3fab84b0b6c273c48c9d7
font_01_sfnt_off0001118b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001299d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299D 17596 bytes
SHA-256: dad10863188cee29ee3b9834c7d818f1813342f94bf006a818cc267b22a1d2c9

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