Malicious PDF — malware analysis report

Static analysis result for SHA-256 8484742901f9bee0…

MALICIOUS

PDF

72.3 KB Created: 2021-09-28 04:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dfd11d6a1bc27e9b977bb42f8c9e26dd SHA-1: a61773efbaf4faadf2474ebc9b5f5ba642369078 SHA-256: 8484742901f9bee0ba233b822d2c547a0d42d8f5330fcc7251ed7fedfdb262a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://bualuang101.com/backoffice/upload/files/gapokedukufumu.pdf In PDF document text
    • http://vxclouds.com/userfiles/file/7876660314.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/xokemepe.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/34147577331.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/4e5ab4882e2c7b2342d921e1223ea7bf/75560239642.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/70066753840.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/39c6fbfefc3a824ed5fe10bb640caa16/waboredajosedinegar.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/82c8e62ab7e2135cef79f18db5d0ac5d/21668311164.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/molube.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/163158352540477bc2adceef4d2c90.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/lugesirejesem.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/tezowadokejozuze.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/53000074911.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cc4b6e811---32371802990.pdfIn PDF document text
    • https://umutfm.com/resimler/files/45103053688.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/finun.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/pedibafediravutotefujezaw.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/9ee87cdd8687f9db0812ad9ce85bd7c4/fajoxevowaxibogomoxakede.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/wofoz.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/51275414020.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/fezamamote.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/kikafipowigofev.pdfIn PDF document text
    • https://nevisnews.com/userfiles/didunagorugesulo.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/23327769998.pdfIn PDF document text
    • https://rainwater.cc/images/uploads/files/55332158927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=apk+descobrir+senha+wifiPDF 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_off0000b5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC0 10872 bytes
SHA-256: 5368bfb30f6115c6ebdb93766b6f0597a9a01d72f776755ee3adaba6ec8686c6
font_02_sfnt_off0000e69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69F 17608 bytes
SHA-256: 4fa3475ccdcc581ed6ec61f0bde55e122575c6639504281d9843e167dc74a9d0

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