Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0aad21858461933…

MALICIOUS

PDF

85.4 KB Created: 2021-09-15 19:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f47a1329ffff35f68381264fd5afaf6b SHA-1: 08f5216b4858854d3f42d136fc7fdf963d8a8280 SHA-256: f0aad21858461933393b460250f886241dfd45cbc7b5d8697bee4f3737d00a0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded URLs point towards an attempt to trick users into visiting potentially harmful websites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=how+to+make+a+quiz+app+in+android PDF link annotation
    • http://edilcfcostruzioni.com/userfiles/files/12286084410.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/94f280045c4be86d11919f7fb6cfdca0/42464454815.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/98132752879.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/dovawaderikan.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6b41ebf2504cd51bcfaca747b72a5c1f/mopevolozasetusoja.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/17911378363.pdfIn PDF document text
    • http://stringladies.cz/userfiles/9381280638.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/jipomari.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fc4a50c0c---46418955352.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/vuzududa.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///bizosupikezogiwesedale.pdfIn PDF document text
    • http://findusafranchise.com/files/files/junuderidogij.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5e5fccc7c---62059062543.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/jakufodujofuzudero.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/35764476665.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/zutubedimuwuwefutumiwi.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/43156705336.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/1059575267.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/sirireroget.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/65064839539.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/71638657322.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kefegitaduxezusijeke.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/40750494348.pdfIn PDF document text
    • https://rjpexport.com/files/sebusotizek.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_off0000eb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001033f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033F 10816 bytes
SHA-256: 72d19ff677fe866bd0ec7143078fb5421d2697a069341da56a42bd670c6b593c
font_02_sfnt_off00011bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BED 17240 bytes
SHA-256: 6b73ae99119659692a93cd643a9da1406e8f31d3f8aa922d3b5142fd6cb21d6f

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