Malicious PDF — malware analysis report

Static analysis result for SHA-256 92490ea20f33f50a…

MALICIOUS

PDF

89.8 KB Created: 2021-08-01 14:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6e657d02d61e7ca013902053de0b2666 SHA-1: 52351099ee399be505a116c7cd37738f9fc37d6c SHA-256: 92490ea20f33f50af13de7f7791bbdf697f434d79dfea9dd4d278f129409d226
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://alphanaturehk.com/userfiles/file/mugud.pdf In PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/esm8dbj0ujug66uk04n7ne5ufj/19722671256.pdfIn PDF document text
    • https://ahha.az/userfiles/file/85243767439.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/qu75fh86tt874nouh6dvvejboo/luwawatotepog.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/2973544534.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/8aujb08e0a4683km69bhghlkv0/jewenuv.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/fiwamobasofituxi.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/zumava.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db7a52c602c---gafewupaliluza.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/156c4f4f6e52e51c5c9a602e5cfe0212/63506624706.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160addeb4199ab---20050666846.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/69349429071.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/12355948230.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/36e46eac3aba763aeb5dc92067722120/73835864618.pdfIn PDF document text
    • http://gardatrans.com/content/Files/suviwojadomijibire.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3a414e8e3---zizagadedu.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202107161615192161.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608877e0c606e.pdfIn PDF document text
    • http://apcmagon.com/userfiles/82089786121.pdfIn PDF document text
    • http://ud2-140.com/files/bekapezegoxipote.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/titotebodedusapunoxanuzop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+do+you+get+free+diamonds+in+free+fire+2021PDF 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_off0000f981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11193 17020 bytes
SHA-256: 530f607057aa6ca741b8db70b9405fd42bbb24e52cecb0e7ae469a35ecff5b08
font_02_sfnt_off00013dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD4 11236 bytes
SHA-256: 0855bad2ebd64d835fd4005d781ddde2ec833e3a0b211ab36b22d6c66d6944aa

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