Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df8e5957ab3bbd6…

MALICIOUS

PDF

79.2 KB Created: 2021-08-28 00:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 582d2ff20e3baa63b1eaeb12965d8ad4 SHA-1: 482dc708947b8bd13139885523e0a0e41fc2db2a SHA-256: 1df8e5957ab3bbd64235de12dd2352784608f19fc19525a4ab87474368e71558
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL analysis are sufficient to infer a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://namhunglogistic.vn/site/files/salutavagope.pdf In PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/d4f53cefc8a81be2eef98b7a3eccd1fa/wudexevogeseruv.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/75008753477.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/a4c08c64bbdc1603eff0d2699f7fdd6e/17150701874.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/55552851594.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/80231660302.pdfIn PDF document text
    • https://mytopics.it/uploads/file/74545970808.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/297fb083752adcdd05dc4f026ca5b3e1/gofupifokum.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca2c44c810---77937604585.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/d06e1fea21b4b3febf79932c1075f220/vibiwemevoxegudikewe.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/nimupo.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160793f6e7ca00---zipudedore.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/40211404782.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/54574409728.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/13759ec6808eb1f3f82f4b059cde298b/zidisorawutige.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/mufek.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f92174cfa---26303214271.pdfIn PDF document text
    • http://fygl.net/uploads/file/230631479685.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7fc5057157---33855086762.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/zalozeforune.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160741c2eebf98---60168487263.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/48309967097.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/dowomujurubazem.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847920ebb9b---65753827528.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/127e417f85623219b305b691760aa4f2/52925387733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=april+fools+pranks+to+do+on+friendsPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f530cee55d8---fowodozenununuzewofe.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_off0000d220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD220 16708 bytes
SHA-256: 81f07c72f18950e05ad473d4918197a7db23ddbc64a487d9f44a1feea06ebcf3
font_01_sfnt_off0000fd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 10564 bytes
SHA-256: 4728652feb5ea7dde1e50b3eb13fd1a1e83b8454691184b54290af6b236ed1f8
font_02_sfnt_off0001158a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1