Malicious PDF — malware analysis report

Static analysis result for SHA-256 73dbeffe33654154…

MALICIOUS

PDF

85.3 KB Created: 2021-08-30 03:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 61f7cfcfbf5c049c46a05db1bf9dd401 SHA-1: 3f1579b137be8f008e051ee3577c23b218d2987e SHA-256: 73dbeffe33654154b67cb9abf6dd34372bf0f448baa3e51ef6dcc62a1f61b9e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, suggesting a link farm designed to host and distribute malicious files. The ClamAV detection and ML classifier strongly indicate a phishing or trojan payload. While no scripts were explicitly extracted, the nature of the link farm and the detection results point towards a phishing attack aiming to trick users into downloading malware.

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 https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/1l2ru7lkiuv3bu3ibd3oakuvov/20891220474.pdf In PDF document text
    • https://tipresentoio.it/images/file/88947442070.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/98d9c81787f43507c48ce2ce560c08ce/54463195604.pdfIn PDF document text
    • http://agavietnam.com/img/files/79423464657.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/siwufetewimokibexun.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/19612850842.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc94fa8ec2---5858622230.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/wigof.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/e191fbb0d27da2bdbd8ecaaf843fcc8c/zinezite.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/93265455840.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/28573368052.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/fupojasubekiraremuf.pdfIn PDF document text
    • http://yoron.net/up/files/64010106599.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/jodisakisifawitununede.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/tozofuzola.pdfIn PDF document text
    • https://noddy.nu/images/file/fagikaxixatekokanutalakiw.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f000e0605---jimaxefiwegodobunefolek.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/lebujega.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/26256854249.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/3eoh28dbidb8gt3l00qucq77b0/6405913060.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079448c0fbbe---42819844726.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/18cbe553e74cf8db27df0e3e766253ec/jixugiziximurepojaxebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ds3+best+armor+for+knightPDF 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_off0000e5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A8 18180 bytes
SHA-256: 836f084d857a040963181fca7dadf942904eafe98e34d7d6600360c38a8d4184
font_01_sfnt_off0001154f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D66 11020 bytes
SHA-256: f59ceb101b27e04288e088ae9f3dca22d17cc8354109d648f722bb0b4091c323

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