Malicious PDF — malware analysis report

Static analysis result for SHA-256 df86097ad013300a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 23:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5db4875c2f35db41e6efde602a658e5c SHA-1: f2a40a55d61ad115b81094d6e273bbcd09b2fd92 SHA-256: df86097ad013300ad781cab2dacd965fac083bb1935c53abb732c568d8891fbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. No scripts were extracted, but the presence of multiple external links and the high ML score strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://inwebjor.ru/uplcv?utm_term=mewling+in+a+sentence PDF link annotation
    • https://amblamy.ee/upload/file/49569526938.pdfIn PDF document text
    • https://nada70.org/userfiles/file/32147634319.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/5949718789.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/99812889075.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ulmq7kuurjurbirnibj6erju0t/70707613612.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/94287425376.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/04943ff0d7e9104fcef6475a1610a948/mojejunavalosobepitamorej.pdfIn PDF document text
    • http://01host.ru/userfiles/files/xisozowofiru.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/wonotesizojafij.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/jenaduxinidisesanodar.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/df18edd48551df3c7cf17f91add60e48/riluvukimukovupisusuxatub.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/5ddeea826cfe136e739abbab9bf8f852/27243128904.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3p7o09u8h0qn97urdj4detrck0/2414307035.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/vonesizigulujepakobupemu.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/vezaralakagogaterixi.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/1ae82425bf917a5c7c0473a3722aecc4/pegejen.pdfIn PDF document text
    • http://philipsphotographystudio.com/83173626009.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/xisurega.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0a9b21782---dejaponu.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/bugesareb.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/qu1eo621c4c7mkbuheavfpd9hi/83006174941.pdfIn PDF document text
    • http://sibservis.com/ckfinder/userfiles/files/vemofakewitutimufuxakome.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/xunolok.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160bffef24e3d5---jebewabati.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_off0000d757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD757 10264 bytes
SHA-256: be7dd4059d7f0e863241d156caff3c05d60fbedd8d96b94235bb24580967c770
font_01_sfnt_off0000ee99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE99 21752 bytes
SHA-256: 96382f616dfe155c2de4150e60c149280a5edae215aed557fdddf718030bf7bd
font_02_sfnt_off00012787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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