Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38a5e357de52eda…

MALICIOUS

PDF

87.4 KB Created: 2021-06-26 12:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e2c85fd7de3fea5e97116bb091dcd2af SHA-1: 736f3637793bde04b808e961d9940c521fb16ab0 SHA-256: f38a5e357de52eda188cf17871801bd9b10ece207c7840c546d8fcf518378baa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits vulnerabilities or employs social engineering. The presence of numerous external URIs, including a link farm on compromised CMS uploads, suggests an attempt to redirect users to malicious sites for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs point towards a phishing or exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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=swollen+itchy+neck PDF link annotation
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87820d8a4f---35130408770.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9bdeed4d8---89625541680.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/43159629111.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081103d18d57---92312396622.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/7fa92521abad7681a8e82784f1423a50/59158191494.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16098538c5cd2d---fesawavoxavaviwosone.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f3635ba8b357e3a5976d404c6b970742/xumujokuxalofikamudam.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/pagesojozoxewegugokuf.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/solamifixaxubov.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/78313780541.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079eb9084af7---nugupibovepudiwo.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/0ra4heacr2856k1mph2iq1draa/xixamekafe.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfa963262e---vedakib.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021060918442873499.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/867ecb24fa34482b1da7e3df56c54084/kaderuji.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/77071664331.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e465d04054---44221943167.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/699d29bd338ac58894fb3152c9f2c9fc/81280529580.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/it98anthmsm2pl5ro6lq0murnu/31116919674.pdfIn PDF document text
    • http://asfalon.com/__files/file/tafarovejuzivufemamowupo.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/daxeno.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/e1410c1c8f5c2a7aa5a2b7999bd79d42/27312075268.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/ac8fb11c1ef008f07979dd043c0d2d49/30596624159.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/57d7f082d53f51c5d55af844adbb4a92/18694497082.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/8ebc06c0ba993e9d218f9988cbdded07/53471803281.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/dofimomozatek.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_off0000f409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 10264 bytes
SHA-256: b9781ff39f6a117e1cca08a7d04326ff46d9a5ff1baf2972c091bd3e98bda412
font_01_sfnt_off00010b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12330 16900 bytes
SHA-256: c30cce4acc539e54c974dfd8d91a89d3095b5955e9ac8a6983fa7fa3f7dcc76b

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