Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7eca957c595cf7…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 03:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1d1d331479607bd5bbacb3506f9f171d SHA-1: 179628a593df98038252865ce174836964fde266 SHA-256: ef7eca957c595cf7583e5171ee56b6b5115a54ca571e4d351d36c3ffd6701234
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, some of which are identified as compromised CMS uploads. This suggests the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://yuqiaohome.com/uploads/files/202109150319369387.pdf In PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6400a168e734980e1c4ff74598a5c66/zuruvexuzoripisufufaz.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109181414478588.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210925091644.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c75aef342862661e8fcdd0a005ada21b/23378801885.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/zotolavefatilufobapux.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/wasutolovekalesas.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210903195032_ijpjtz.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/vojaxikaxidopilusuv.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/99780380386.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/tunalos.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/soletegopowodajop.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021091605383327.pdfIn PDF document text
    • http://regcureguide.com/files/files/58201850660.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d8c4690ed---goralevopox.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/faruzatajoniwimotofapaniz.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/gokabovibavejivagenogoz.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/vabilazimowuv.pdfIn PDF document text
    • https://sainaudit.mn/File/4622633768.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/kazefajezoz.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091312274522.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/nuwanewunuwixadusipipe.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/77006627234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=narcos+mod+apkPDF 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_off0000b117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92E 10272 bytes
SHA-256: 2a09c1e79fd59c2bce1a77496f10cda71242925deec5509a1d73f1730869e716
font_02_sfnt_off0000e04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04E 16496 bytes
SHA-256: 03704a1f6f01ad8526dfa0dc9ec218c0e85b4fa71244377da85d61cbb2cd6672

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