Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d512ca3f975735a…

MALICIOUS

PDF

103.4 KB Created: 2021-07-08 01:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 42bbebe1d9ce6ca9d7ede9dcb555a0b2 SHA-1: 6ed2f02be8aa94602dc7d0509323e0b4a310cc88 SHA-256: 9d512ca3f975735a5ecf2ea5bf1dd7ecfb5cdd615b11f06d1cd7ec1a7d84d6f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or manipulate search engine results. No scripts were extracted, but the presence of numerous unknown URLs indicates a phishing or content-distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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 http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/d3c9d12202ec4c4387c92dc4a066bda7/wufeperoximosedoparagawi.pdf In PDF document text
    • http://gloria-eurex.com/images/blog//file/domomusufo.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/xasowulawisomojilumulir.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160712ab983a22---34539366271.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/pegekuzeza.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f0ef79e70---gabulijefikodizere.pdfIn PDF document text
    • https://bjsteelvietnam.com/upload/fck/file/39334481289.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/f57bf06baad745c55bb83e5353203ff6/68762059001.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e6b3b7b1---60614521027.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/26661658772.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/telewijasilobum.pdfIn PDF document text
    • https://menu2uplus.com/images/file/zovenokidijidukakuxonuwo.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/be8e8f10f26d8964a72d746cc5507e65/winabosirenigexi.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/18cff117eea0e1fb33f05f8abcf1cde7/gosaweridir.pdfIn PDF document text
    • https://susta.vn/userfiles/file/lonafija.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/bff8930a9326db4b6593a298fe2645a0/nipijinizudafidudexipug.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8935ec14ac---vixopezafadisuxi.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/68036881439.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/kemilutegofinimokasuzeg.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3cb064aee---67488633468.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e740853748---81642212325.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/gazube.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/46888707324.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794f2a799a6---lovevojoji.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716979d3380---60957570482.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/2403731852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=solving+a+system+of+linear+equations+with+fractional+coefficientsPDF 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_off000128dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000140ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140EE 19888 bytes
SHA-256: 2eb23650478a5533124032e6eadc94248d4b60de3e2adb3f1dfb993a85939c9d
font_02_sfnt_off0001732b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1732B 11372 bytes
SHA-256: 187f9a97c1ef6200f5ada7a75b3d5cdefc95ebdce865b9df6cdc7111483ebe2d

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