Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bad62d4ba0b7e01…

MALICIOUS

PDF

89.5 KB Created: 2021-06-27 23:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8ff4728170caac9d8ffde5c1bb157635 SHA-1: 27a6528b76940c1de0693b271b6288a84f2e06d9 SHA-256: 9bad62d4ba0b7e01e0aac815477b80cb1dbba0578f5a9ae1e5d0b231eefcfd7e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress upload directories and other potentially malicious domains, indicating an attempt to host and distribute further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a common pattern of using compromised sites to host second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/3d105fd8493b7c8457f44ac41bef769a/petolovi.pdf In PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/42628286266.pdfIn PDF document text
    • http://mousike.it/img_ins/files/pewomumibowevo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085082ce0375---62073165837.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/giminiruwoxegawot.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/27813056866.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vesanonezimeboxu.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/vumawegivavewatemus.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/1m40stuleaul910gf6leb5b1a6/gufofiwumel.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/29304678166.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ab45a03cc2fd211df6048818465dc27b/10328204361.pdfIn PDF document text
    • http://masihpt2.com/contents//files/zexokulaxasixido.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/safitapowegodaza.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609901fccbfc0---wizomalokedoresimunavam.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/fqbgpj81s4gcpmqecm78e9sd65/79514187025.pdfIn PDF document text
    • http://parentini.it/userfiles/files/93606682090.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/1d78a2d6614b34c7ef50335caa3863f2/kudawevuja.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/t3e3pbhc447juku11j3f4pnuo5/siwixeg.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/aab246644b9e771fedea6d8b3c6afa7c/79652096279.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/59015900429.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/78037831376.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/46033639719.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/1493035376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=interesting+questions+and+answersPDF 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_off0000fb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB68 17288 bytes
SHA-256: c895225842abb1db8803e917e5131dbf5e0fa99b14a7b29997f3a6fbd0a92862
font_01_sfnt_off000128b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B8 10660 bytes
SHA-256: c72fe8ae7f03dbb0ae60998b70e960e75ee8298bcfded7d539ceadec377db70e
font_02_sfnt_off000140d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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