Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a0734ba8c1e575…

MALICIOUS

PDF

69.8 KB Created: 2021-09-02 19:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6cb4851b7870565c747e824d194010f7 SHA-1: efc0f93832b5066e08540dd932dfdbea94a0f848 SHA-256: 98a0734ba8c1e575c5935418573d7a16234d6bfb67bcf641f548e1b48270f666
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://infrive.ru/uplcv?utm_term=chesona+bluetooth+keyboard+manual PDF link annotation
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8ebf04a82---lolorewewogukewabiji.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/0abdda9d3689c9f6f0b962472cd001f6/nadubirufe.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/23610009599.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/22975012778.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021071405231443.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/wusitenubujurinumil.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/88452199793.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/efc9ef3ee5ff512137f8d7e2268c4d1a/50575236763.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/91e72d280d9010295380fed02ed9e11d/musulugariwogifuxavozawa.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/xixomifiwalerusabom.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/gowigagefiwufusikevi.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/22275789683.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cb90ea06c---36268588311.pdfIn PDF document text
    • https://hanomanberjaya.com/contents//files/69088019542.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098bee7081dd---walogimarewurona.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/857a55f21c4ff39f70c88b321d1b6216/32108751232.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20218192327458216.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607269598041c---taloveken.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210628112943_dv27zn.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612d0eda099a6---70626102784.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/xibewodumopuw.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105586ca229e.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/xonuxasarakokilufefaw.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/xukipetizewofutevite.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_off0000b198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB198 14956 bytes
SHA-256: 489c82ca60f8c5fce364ecf36a396c4761602423bbd012ea250df6c8b4f1c09d
font_01_sfnt_off0000d734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD734 10900 bytes
SHA-256: bbe3860040e4125a0b8b0355dacabc0c9c8c436cdd7d41e47932358f340f1feb
font_02_sfnt_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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