Malicious PDF — malware analysis report

Static analysis result for SHA-256 62bcf9075f73a05f…

MALICIOUS

PDF

70.1 KB Created: 2021-09-04 05:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d18909918f6e8e978a9f1d5ff4f994aa SHA-1: 6d0d585eb83c9cf826b8e34545499f151162e094 SHA-256: 62bcf9075f73a05fdc1f5ba83dbdf9e894ab0194b553a8d5f770c9c5577de057
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external links, many pointing to compromised or disposable hosting, suggests a phishing or credential harvesting attempt. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/lupejumevigis.pdf In PDF document text
    • https://nanosoft.mn/images/content/File/pipijanizil.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/b925rop05i17kr8cfc53k1gpup/magifowowizorod.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/52934233882.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/13646816356.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/xagunet.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3d1dd7e73---3963281738.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/colovjbkt1cosvo50fbp38va80/mizawerezibogutogu.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/67731857132.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/57299213142.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/20148457252.pdfIn PDF document text
    • http://househouse.it/userfiles/files/59737996417.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ibanuku.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e427ebef759---zaginobut.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f58d9c6a60---zibelibodabidoxodaxe.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/woxexot.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a34a49d0c2a---69922320842.pdfIn PDF document text
    • http://kco.su/userfiles/file/kopovizogubaxizino.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/bexadipagulalov.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/5b1eadf604ef9394955544f588bbf759/xumefaludiwovobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=statistical+function+in+excel+pdfPDF 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_off0000b164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB164 16352 bytes
SHA-256: 6d9de6580566e9f30670ef097c2e4faee06f2e43d629bf674a15bdb57efc0192
font_01_sfnt_off0000da60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF277 10788 bytes
SHA-256: 6d7c10bb7e85a1f6a13eab8fb5e99e4311b7c3ab9f65b8aa5cdc646be2ed4d2d

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