Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9c4488aac5e16c…

MALICIOUS

PDF

81.3 KB Created: 2021-06-23 02:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 53fca31226cb7e75e45426a36f4f1506 SHA-1: 18c6649bc678e1fe02e22adc80669bd68a7a491f SHA-256: 0a9c4488aac5e16c7a54671ae632fc7a2075b7ddc8a61413351aab436594945b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The embedded URLs and the PDF structure suggest an attempt to exploit user trust by presenting a seemingly innocuous document that leads to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://eko-inwest.eu/upload/file/wejonubuzavilemogob.pdf In PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a7119da81---sewejeg.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/ca51e4a522e637708c8b926629c4d3c2/71406679755.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/nolukaj.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/4157871216.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083f91473626---56876490452.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/3227479440.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/f339hk15htrmakap0ej8vah9c5/56868943266.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49d6d4efeb---10426641893.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210515044414753.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5656285eaf---64314260502.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/34100c4492c1054b03004a0c7c8fe699/moxilomomunezakoz.pdfIn PDF document text
    • https://susta.vn/userfiles/file/21641378649.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=wow+pet+attackPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B5 4788 bytes
SHA-256: 862e5ad876e28aa6dd48652d0873196176a03325398daeb8e4f4d089bb23ad1d
font_01_sfnt_off0000f32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32F 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0000fbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBD 11236 bytes
SHA-256: 01eed48d373309ed0a896fd2c496172844a23a113a402ebad351cd70110d2433
font_03_sfnt_off0001223d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223D 16340 bytes
SHA-256: 8680b359cba86e2f6e9a78cf8c0f9e51b009e062d62f51157c34cd29f25a410b