Malicious PDF — malware analysis report

Static analysis result for SHA-256 660f61e879cd9cc0…

MALICIOUS

PDF

85.0 KB Created: 2021-09-11 06:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 792213ea094147d14fc3dd052b4d5e93 SHA-1: 749ae5770605dbe943b89f0a82b75d6c6babc936 SHA-256: 660f61e879cd9cc08ea702c23af1ed136f86dd36164c68fcb3aed376a6ce84f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple external URLs, some hosted on compromised CMS uploads and disposable domains, suggests a phishing or malware distribution scheme. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into downloading content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=among+us+11.17+mod+apk+download PDF link annotation
    • https://ags-car.com/upload/files/35164835955.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/22727757760.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/29816353979.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/vomagugegideso.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210901_203009.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/bubezesazunujenejonosix.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/1548443865.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/30890270852.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/66087830160.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/84115609979.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/9853143206.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/25510182973.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/86768162632.pdfIn PDF document text
    • http://adriennemason.com/assets/files/sowimibamatonokevoporarox.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/88671479911.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/77894719483.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/ttselkbq8dunesafc0n7iotdq0/pakodo.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/62781571697.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/jiwixidaresivelufan.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/17008714525.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfd641cc30---79533511191.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/lopezimura.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6b3a7cf0ff56ac922f2f3b093e4e3d61/9798061747.pdfIn PDF document text
    • http://chinalabware.es/d/files/nulelokasubedaraxurowew.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_off0000e49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49F 19128 bytes
SHA-256: a5ca4c124d8e276885ed6afd9ac682bbf0e7975a6d35b47e31c07288cb2d72c5
font_01_sfnt_off0001158e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA5 10740 bytes
SHA-256: 60862f21bde61b32d027ffc63821bf3180e79e8525e4044e9c3ed14970b4628e