Malicious PDF — malware analysis report

Static analysis result for SHA-256 e22c3d08cdc87d2f…

MALICIOUS

PDF

169.4 KB Created: 2021-09-02 13:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 813f0afaaaa2b541a72afa42541d06cf SHA-1: 110ed13717b6bda47eddbe0e19f8de2ebba7ac8f SHA-256: e22c3d08cdc87d2fd112eccd16ffbe6dc2c0b00e40cac1f869dae208a586642e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. No scripts were extracted, but the nature of the links implies an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://philabc.ru/uplcv?utm_term=cubature+des+terrassements+pdf PDF link annotation
    • https://gtselect.fr/ckfinder/userfiles/files/91968293813.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/711laudesqgi7omm5b9fflrm0e/76370648876.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/denoborafogilenawo.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/97850536821.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/wotagolumigawefuzeden.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/kazokefumefuxisime.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/duduwe.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/jaseb.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610ef9f484d2c---bojenavobizebe.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/66623ae3c753da5fe2eead6184e19453/lakebusafeneguw.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/54197529053.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/waxasilinamipivapuwavivu.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads//files/202108111918107735.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/55423898327.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/99237329557.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/kulebudurel.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082efdf669d4---79702527913.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/34399329794.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612c7692340a3---zixusijakobevetuxej.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/20369325567.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/fosivawubesoma.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/4383184111.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/tixijipamiwupil.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_off00022f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22F38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002474a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2474A 22316 bytes
SHA-256: 33ff85ea913e332200cbc258ec7c9680c81641a7a6dbf039d2997f59bf3a1729
font_02_sfnt_off00027f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27F23 10672 bytes
SHA-256: 055170943a489bdb04f36808a4d9166e6a925ba7e060843b8ed0fb9212826d2b

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