Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b02f4b8f6bf4188…

MALICIOUS

PDF

97.9 KB Created: 2021-07-22 05:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0ed3d05d38fef318b75be7c881a3a3db SHA-1: 7cd47720772224ae7986061550168a587ac3f617 SHA-256: 7b02f4b8f6bf4188763d5c28012b8d37ff58676f3e5dfc2f611fc2c618e2d472
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content. The presence of external URIs and link farm heuristics strongly indicates an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/0uvb9j966vlp3q5p762rkdmcbq/waguverakuxotuduvural.pdf In PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e7a273b1c5d---sejorerotob.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c8fae3c0c---79041822301.pdfIn PDF document text
    • http://metrokentakifinan.com/resimler/files/54128335624.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/83911356592.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/15ef4f8c341ee69a04afa3d91d2ba492/pukuzefexedaropopap.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/sobuxaxuzekoborugolafus.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb648379dd---16278828770.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/45af0393dd41e66b2710c7979e771b07/fajonanodigutawab.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/3c87n30hjim87e0euuh8h90vvl/39532155758.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/pefutofi.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/33m43jk8n341m773883niq97hk/duzek.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/ruzojodok.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/a8823552e12f3a5e50556777143fd2d2/kigudomi.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/89710240114.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/gujesipopejop.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/08d5178c46cb3e712a80772bb6545cf6/90615559742.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/rokosisobowewezuboseko.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd59663eab---rutabumelalonigosifajopo.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/7f6d8643c88881392fd289c7faad3c99/91164714986.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/i0sjodfep4t4oj7u75e928vmp1/97960628501.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/83891659369.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/85804112800.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/kb8co40ada9a0fmbmcv0up6754/tulumuvuxajerixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=2nd+year+physics+mcqs+with+answers+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001020c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020C 11088 bytes
SHA-256: 0d6d8187c4a97596028484f7985ab5de8109b94befc76e242db5a9d547491c04
font_01_sfnt_off00011b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B98 16088 bytes
SHA-256: d06246de5fbca08a8e71b3266423534d5cc020e17a1f81eafc946de7058d617f
font_02_sfnt_off000130ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000148e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E0 18304 bytes
SHA-256: 6babefa4d0bd002875e81a7f2f202a27eb0aebe8bdfe079d14028d0342cff84c

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