Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8d5098c46adf57…

MALICIOUS

PDF

89.9 KB Created: 2021-08-10 13:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bfb0f71cc619d2eafeaacebef3d9152b SHA-1: 786f4b3946f9556c6df89ac19800dc9f0a1a0bab SHA-256: 0f8d5098c46adf5716b6efdb35a60ffae5906c3ed45379544aca46072577d5e1
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The primary purpose appears to be directing users to external sites, potentially for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://oniceh.ru/uplcv?utm_term=cuantos+tipos+de+adjetivos+hay+y+como+se+llaman PDF link annotation
    • http://broadgatecapital.com/userfiles/file/takunefurifexolesunovup.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/8029d5a6af30b315cb06df6f6fa6e0f3/jasepiwu.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/64670927957.pdfIn PDF document text
    • https://dcimx.com/files/roxovov.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/kezudedese.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/54473483669.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/bobisibozupexamot.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a3828b7a0ad5dadb21d9699956638f61/vudowodimavo.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/jojibukujeka.pdfIn PDF document text
    • http://fygl.net/uploads/file/13092939884.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/mowufaxuxakuvedetoni.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/55607235156.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/79654052388.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f485ab6bd---9658710697.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/48768884300.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160824d7cc8ab3---zaxufafepuxosiwitito.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609462c054400---tijirotixerapuwa.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16083ef15d6edf---zizigogapenimuvukazakaram.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/st4ar0adc6uqigqtn728s5fc26/mejeburumoforeloves.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b27265255---dudufugixak.pdfIn PDF document text
    • https://xn--80afc2apd5n.xn--j1amh/upload/files/jekaretikevaruperu.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/71976581442.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/vigaxaletiziwire.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4506b14437---76827600978.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/034efbf31501d091b8c5f92019a3b881/26212902401.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_off0000f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA6 19100 bytes
SHA-256: a4851ad099b22127981bc1e8f57d9e5a0fbeb370cadc15bda568cd73240bb017
font_02_sfnt_off00013df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF7 11120 bytes
SHA-256: a22dc7e3fe131fa1b2f8aa23a2a180216ad61edd7b6a977b277d84b83e01d1b2

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