Malicious PDF — malware analysis report

Static analysis result for SHA-256 5284f0e84f16a1f9…

MALICIOUS

PDF

87.5 KB Created: 2021-08-26 08:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d983ac2225922ec388afa91c463cb908 SHA-1: ae2eabccdae1018a2a8cc6f307efd3f1e523eca9 SHA-256: 5284f0e84f16a1f906ccde605ebd194919fd9b18d167a0297d7d88a166c5a97c
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple compromised WordPress upload sites and other potentially malicious domains. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://alfadent-volg.ru/images_uploads/files/litepusovotarofonimamini.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d78fa4e6d---85764031893.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb27ae73df---37179584609.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108cfcf8f9c8---jegonadaj.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c241474bd9---54068128842.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e95832b8252bf63395830d7dd8238490/digewobitipus.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/42661480690.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832e9582ca9---65876496577.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/781b27dffb88fd91b61a7e3ba55d1898/veviliw.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40cbccb00f---37123778602.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/tsikaplb3evjoudr2b3msl69p6/7684856307.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/14517698177.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/pugujazip.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/5e1552935e5b9d8695dec3276060f16b/rumepe.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702e012d4b2.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/xovaniwapezovazisalukaz.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/gaxidupomuwomukivim.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/63732606223.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160846c6512b24---72517521148.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/0j1t9nftlkef8dfc472b4jeff6/widanariroxufe.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/wiradud.pdfIn PDF document text
    • http://mamam.by/upload/File/file/49108460067.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/89328300765.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/kibetatowamarelijokaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=lyophilization+in+pharmaceutical+industryPDF 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_off0000ef62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 11012 bytes
SHA-256: 7665fd50dc81bcaa3953c7dd50332175955f4dfc27a84c6366e808f3302221a5
font_01_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E8 17704 bytes
SHA-256: 0de0ff72ed309e9d5276f9194494b64c33a4a24022710e94815f376854a27ecf

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