Malicious PDF — malware analysis report

Static analysis result for SHA-256 4977f32dff213ddc…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 04:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 588d217af7b58971943da1ab7fe203cc SHA-1: af91179e59244383ec7ac2f715c273e5207f00c6 SHA-256: 4977f32dff213ddcbecccf0e7fa98be4386e23039babaf1a40de41aa7fa0997c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://nesthomes.in/userfiles/file/58869373492.pdf In PDF document text
    • http://oumkua.com/userfiles/file/zalideri.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/b8dd46f1d9819ef40f12f4961aa1cea9/17544706002.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/2v0ugvsmje9v9ktd31bgj1khd6/kunonelaw.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/91312349097.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/4043c36c90cd4f0cfe2f8aca06def525/mokomojeli.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/73642996609.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/xofefopatufaxikusunu.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/66017876956.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/24631825062.pdfIn PDF document text
    • https://puppometalli.eu/file/46723523.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/eb34141a93c8b3f60d5f1e734b228be0/3840528876.pdfIn PDF document text
    • https://m3csrl.com/file/88236779526.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16080f4d426d5b---telosolu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987f8bda369---3325698345.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c6b255bd65---nolulo.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/75332334710.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/vefulijavoforul.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/kazeno.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/tefodux.pdfIn PDF document text
    • http://granitabrasive.com/editor_up/89193993812.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607828d5b0cc7---11269706411.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/14238714595.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/6b145a877a03874dc263eadfed76995f/xuzosojunosagexofi.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/ojpfnkacjae888pbohr4ft63on/vewoduruliropufumodos.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/vixivubetonol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=executive+administrative+assistant+resume+pdfPDF 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_off0000e025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE025 10868 bytes
SHA-256: 55ce559adaa70e78d5e048bcc6596c4826de4c211a1400b7fac56bd71aa50c9b
font_01_sfnt_off0000f940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF940 17216 bytes
SHA-256: 62b26e29efffcadc0468bf6f22d7da66e50b95065b23c88d7b8c931c9221733a
font_02_sfnt_off000125d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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