Malicious PDF — malware analysis report

Static analysis result for SHA-256 e931008ea4d5ee7b…

MALICIOUS

PDF

84.9 KB Created: 2021-09-02 22:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 49dd8d1e2815b197082b60c220400ff8 SHA-1: a09d490d37f07ee210cdc7a50603ec7949cd442e SHA-256: e931008ea4d5ee7b53bef891876c867f10d9b8b73ffe0cec7499566c1eb4c1f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://irlanc.ru/uplcv?utm_term=spline+shaft+design+pdf PDF link annotation
    • http://vankouwenenmastop.nl/UserFiles/file/wikamab.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160be7196a9595---78333801464.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/21980826710.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/27882289984.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3d1f6cdbv4sb199u29rpji1s96/52454230732.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/60074883508.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/38642318610.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112409142768---11285403947.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/fugavapi.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a8c967efb---86779240915.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/44106153219.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/lamilewopixujadixomakilim.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123c32e27060---roxasovapotigoludorumebu.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/083d8190e041aa95f38e5e8def0d2047/wejuwosofigigugo.pdfIn PDF document text
    • https://akemi.ro/hirek/file/25167710745.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/0lgfv6m4f802uc6klcjupoueu5/sipowexilowixebapixeriwum.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/e2e268a247917a0adfcf8696e141edb0/79911546517.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/kubanopebotepilupubaje.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/e69921421c985e495acb847b2c760283/74654246104.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/77550917018.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/58305248692.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/21024446480.pdfIn PDF document text
    • 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_off0000e5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F6 18520 bytes
SHA-256: f8766268b12c43745280c504701134399ced07fdcf52b156a1fe1ffe6d8830a7
font_01_sfnt_off00011625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11625 10632 bytes
SHA-256: d3bf5b57bafbe1ebb77a11299792fbe3728b9af230f1b24ff533a2993fdd0d1c
font_02_sfnt_off00012e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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