Malicious PDF — malware analysis report

Static analysis result for SHA-256 b616e6b61e684c7d…

MALICIOUS

PDF

73.2 KB Created: 2021-09-18 15:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f61eb0cb9534a2ef9cb0923866e0bc3 SHA-1: f436be7aaf2d34f77cc67c1ad24f4adf111b9fc8 SHA-256: b616e6b61e684c7df0be932accf78e252f3f270db3f0da58079b04acba9f75d3
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 phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of embedded URLs and the link farm structure suggest an attempt to lure users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://easy-sleep24.de/shop/images/editorfiles/file/fuzifivawuzav.pdf In PDF document text
    • https://insp.biz/img/file/liged.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/cec7e0b95ddc3d3855cfc19ba414a6d8/wisukorapi.pdfIn PDF document text
    • http://scpt.it/userfiles/files/judawo.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/botuzukamexemasuroki.pdfIn PDF document text
    • http://nscenter.cn/upload/files/gewozazorir.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/dugitop.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/70413733704.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/jinevexefubudol.pdfIn PDF document text
    • https://clubon.top/uploads/files/53043960106.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/vemuz.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4b5e83531---86867650807.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/41913856937.pdfIn PDF document text
    • http://poiskvod.ru/images/file/97514843785.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091810222051368.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/81343000442.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/sawanopebuxipuvidorupu.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/bf36d479be3aa882218d091aba42f2da/69658601397.pdfIn PDF document text
    • http://vaithun.net/upload/files/13726818255.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/29034178241.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • https://classconnbio.com/img-jacson/files/72555804026.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/xifewusowawonosariwi.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/81467057801.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/boxugi.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/49296031497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=gta+vegas+downloadPDF 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_off0000bb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35B 17276 bytes
SHA-256: 493bf93d0380734f7c820078e436a6b32957171171dcae62c0a6a24eb9fa53a9
font_02_sfnt_off0000ffc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC9 10424 bytes
SHA-256: 1ed2462842daa118aa01d11b80bf091f9d4ce39d436022ec1d6d592853ae997e

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