Malicious PDF — malware analysis report

Static analysis result for SHA-256 952b55d53ac6258e…

MALICIOUS

PDF

90.3 KB Created: 2021-09-04 00:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 21ea58b2e4e8fbac61ccd96e25cf67fe SHA-1: 93073869882c5a76e75087bd084c8e6d9c4d94a0 SHA-256: 952b55d53ac6258e3d3412141232487e2f4d79d8be279ffc4b9aa40e548a1e8c
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mimpiindah168.com/contents//files/jebuzojelutosiw.pdf In PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/7b57568d66c80749a3ed1e7e8a3e8f43/luxowagokufim.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/rewurilexazidadizoto.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/70290252686.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202108211809111597.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/60533560992.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/277b3590ae4539212451d26f06f5571b/82609920869.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/qs23rugkurv4r0h7o9l1g9lhp2/golixivijuf.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707dd46e9a6---60616738544.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/3a78fda6559aeeedcd14ec1f77f4fa30/27260831742.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/57547634750.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/6564af0d5205749b9ee087874277e5c7/xuvejofemu.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/mikasewusovaxosuzi.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a70be4fd1f---67874120810.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c56a26af09da6ade3c426054c4ddbf15/42305187166.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/24363639641.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/zixivipozifopewe.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/63202646267.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/purabanubopofepozivos.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160795a4030eca---75800653031.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/bubivusawelidosiwuwokopan.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088497b53f4d---radiji.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160733b889a634---zuruwawiruzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=philips+respironics+bipap+a40+user+manualPDF 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_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 21252 bytes
SHA-256: bf8e0f79ff4e39b0ad7b3eacc9b4e9daf257fed62e77114a05e2f1f22b1efce2
font_01_sfnt_off00012a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8E 10980 bytes
SHA-256: 76f1141807aece22fcbe7df3ab991b47d4a9ef9538ce268213934f021cbf1ebd
font_02_sfnt_off0001439a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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