Malicious PDF — malware analysis report

Static analysis result for SHA-256 db010d16338b4cf4…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 00:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e8a55f5e421a4efee1b66ec7203c779d SHA-1: 865b25cc80545f175d0eed29b67a0da60f5560ee SHA-256: db010d16338b4cf4d0c9a2f5e85fdcb75f7cb33884360c3ce94f482dc7cba163
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings suggest the PDF is designed to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=improve+your+ielts+writing+skills+student+book+pdf PDF link annotation
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1aa7751c8---25726046160.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/19fd905022c672b6ab0fd2b110ab714c/mewujese.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/96792597289.pdfIn PDF document text
    • http://metapolar.hu/tmp/68738434053.pdfIn PDF document text
    • https://renetravel.ro/images/files/liboperuxomodoxilajogazib.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/sagiletudobajokamibopanar.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/xivuwepaz.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/nefowixawevekubusakuxo.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/17000930997.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/6f06d4e534d23dfb541f0a9708c5fdf9/wabugoguvajotawe.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/gawulunusoxozigedafegi.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/liloxomewowin.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/tovefogedevewiwonez.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/sigobegiwujalasalabila.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/ffebe92b73b1034f969250ac72b3cac0/49038485846.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/8258579737.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/83551390815.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/fc907f2f24a99766600c4342d6ffcca8/sudez.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/vasakasi.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/55408323201.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/d4db4ce710edbe2bcb9001148fa8dc0a/68111978108.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f7b2f25be---93942902955.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/2076605168.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/vamupujipitovatavijo.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_off0000cf54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF54 19928 bytes
SHA-256: c29b3fa6d4eb993e7abd1a7ea0d8095e6ae8058b2b596acd26bf95b0df2662e5
font_01_sfnt_off0001031e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B35 11228 bytes
SHA-256: ccca8e586916bc836732f0cb537e915f41faaa94570bd268e10f0e327ce7ba9a

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