Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35519a990e8d95a…

MALICIOUS

PDF

78.4 KB Created: 2021-06-25 18:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0fea7c8e5a9c17cf34949452c81bc6c SHA-1: 68c3379aff684e28f1c0f666c79a5f8ba4c34cb8 SHA-256: b35519a990e8d95a43fb913200b681bd6eeddc9466d2cec76092df540d0bd4eb
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting sites. These links are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://mmprogetti.it/userfiles/files/jukawoduliwuxotozava.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ivd4i6b2b3bh1op48fg1eq3hh6/sebozolamunolusubipuzija.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/c75419ba7dc192ee9e4e768ce0f99c75/bulusujuwinivosipagama.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72f470f347---6612481218.pdf
    • http://pamat.ro/UserFiles/file/gulamunoxulujuvime.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a64cf3e02---81862307790.pdf
    • http://slenderclub.cz/ckfinder/userfiles/files/56424747098.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c309b269175---48149353374.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095eb8d13310---nosilujepofudajaxuwi.pdf
    • http://flywings.sk/UserFiles/file/54615113475.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/7v4rr1gp4vhakmmdfgv6e23mkb/1588446177.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bec7f47c8f---3919030907.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/4dca75501d0e839da194cf1aa3c1ea72/zilezodesivebunofatavi.pdf
    • http://studiosimonepantaleo.it/userfiles/files/26250399747.pdf
    • https://aimara-bg.com/userfiles/file/lawozuw.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/fopeg.pdf
    • http://kameleonhastanc.hu/files/file/80049938908.pdf
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/tawenuvini.pdf
    • http://barcelonasixtytwo.com/userfiles/file/72677953782.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/9f729032afc436d94117a2ab12dcc441/20689977997.pdf
    • http://sluchatka-shop.cz/files/upload/files/65843922788.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/6178b6a73bbadea2ae55b650488dbc98/49926870329.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a41525e773b---72502477682.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/c71f4f2605b88e0f0497a5bd7edc4332/61191710448.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=human+causes+of+deforestation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ad.bin
66c1b68710d8dfeeff630b951c05392d9a021bede928995077b6df8f97eaef34
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AD 16924 bytes
font_01_sfnt_off0000fbe7.bin
4001e2643076cc7bbb34fa563f97a3565174eae081dd4896f6a0f3d1c240ba9c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE7 10684 bytes
font_02_sfnt_off00011459.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 16792 bytes