Malicious PDF — malware analysis report

Static analysis result for SHA-256 62db9eef409cd002…

MALICIOUS

PDF

81.6 KB Created: 2021-10-24 05:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: efa7ffa1ab19b136613d877cce422349 SHA-1: 7afe1d869ed03f94b4e63a29cf94a5a8bd3cb6c7 SHA-256: 62db9eef409cd002cf726616c24292956a9728da9f260199fc175dd76f631f14
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is structured as a link farm, likely to direct users to malicious sites for phishing or malware downloads. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://actybrain-consult.com/Upload/files/81359357624.pdf In PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/pigepifajo.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/97324876498.pdfIn PDF document text
    • https://buyafranchise.org/files/files/gelasekujifuka.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/31474740511.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/wewidididigawa.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/53568665389.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/15819568550.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/naluligidukakidububa.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/lajituwijefu.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/potised.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/jupegopaduxetatubaruw.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/80993044851.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/dunavon.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/faxipajedegopikoda.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/pemax.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/38667788942.pdfIn PDF document text
    • https://solturism.ro/images/file/5941070321.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d3f2da4b7a---93759006617.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/tuxuxamafabimogaxojezusi.pdfIn PDF document text
    • https://nada70.org/userfiles/file/93918547828.pdfIn PDF document text
    • http://egitara.com/upfiles/files/58456111758.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/diwezari.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/0d5e906e5e9a33533fb77f3670416386/20808915571.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16163b0e558284---pulatiroki.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/TSvcnjQ06Jg/uplcv?utm_term=a+candy+that+starts+with+vPDF 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_off0000da6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6F 10416 bytes
SHA-256: 43ecd4994ec45c48da53ab8c0a809d1f24c30d9c71306c265e1fcf3e1bda692e
font_01_sfnt_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 18056 bytes
SHA-256: 64a32dc1431581a3d5901f20e8003587cc665aa7dea0ac0ca175fc692531ad37
font_02_sfnt_off00012059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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