Malicious PDF — malware analysis report

Static analysis result for SHA-256 0748b1eaa12eaf1b…

MALICIOUS

PDF

90.3 KB Created: 2021-08-13 18:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 537bb3c444fb44a5a0d0584bbc49df75 SHA-1: d691a7de6f091cd54f5346b96d8909b2c8180808 SHA-256: 0748b1eaa12eaf1b7de771dde4bd3d37b9db1e6ddb176e18abad26fb07ff8cb8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload. The presence of multiple external URIs and link farms points towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://porterbrothersltd.com/app/webroot/uploads/zozujolumuwedevi.pdf In PDF document text
    • http://gesundimjob.at/images/content/files/fomavatupumor.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/rubapokopikomunelawuxibem.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/b7c6d2474ac0be9454902a2185806539/90336968010.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/59418974355.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7cf491e5edf9c7e611f4f1f948917ed8/suredatokubabebenenu.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/6651716296.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/99274050952.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/17011701084.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ace286ac3dd---kabijevabatol.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/69e8b4e69b6d22c92ea87043754c8d57/48948546481.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b198f4159---sidifivadut.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7d023b0d4---38727232046.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/wixoketabujopupenokab.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/s3sfa8m5tf010pei52gjuupro0/gilividinefej.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/24566470253.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/59763652599.pdfIn PDF document text
    • http://vanphongphamhienluong.com/upload/files/34909143409.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/22299822740.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/zeretazikabudenalanikij.pdfIn PDF document text
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/11095305282.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d25d141e398---kujolugokumipipudetax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=difference+between+absolute+advantage+and+comparative+cost+advantagePDF 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_off0000fc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9E 16776 bytes
SHA-256: 66d7349e75ce576efcbcc7dc398fa4d186fac18e07bad1579039f1681b19c43f
font_01_sfnt_off0001285e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14075 11356 bytes
SHA-256: a28d19d0fe43f7a5608203da6f3fcbc19d07e0fac27673ab5b9608ce9e6c6073

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