Malicious PDF — malware analysis report

Static analysis result for SHA-256 b34105c1dc2d96d3…

MALICIOUS

PDF

104.0 KB Created: 2021-07-16 20:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d7104f8d795fe4bb8992b7b8c518953c SHA-1: 21f7ace609de5ee36839d088d667cf9162158502 SHA-256: b34105c1dc2d96d39dedd78526f43d86264f438d486270866a111de2d56db577
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads, suggesting an attempt to obscure the final destination or distribute payloads from various sources. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9708

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://akita-inu.lv/www/files/files/52179146051.pdf In PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/04a9edcb90d361c3b9430e34afd61884/97765010908.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/dirobazoloxa.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085aa88b34cb---79910506018.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/mopuz.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9de69ebb6---voxawat.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b14f74402b2---88723996143.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/29520799299.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/pabakinubonenudetev.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/27259068341.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/tulegizarijiwabavetas.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/ccd7b2be0aa1ce149df478414964bf7e/gusoxudamotavoxe.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/29666855177.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/70229988382.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/f32231241951028557be891572225bca/lojepejagovixewuzo.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/kolowiwelo.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210715_9994F199331CCF88.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/tm82i62ker4jb52tvq035bkh3c/wajezurimawusilafojelo.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160efd4b2e2139---wosawatut.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/akvvpe01r9bv14ah9j13m9qns4/76340439031.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/gs675tnlaojmcmco038lmre0i0/poduvewokusegosurezovene.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160728305794bf---kekak.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804647c1939---74807664402.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/37697312554.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/66700186928.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160982f49e4a05---foviputalarogokepegeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=that+time+i+got+reincarnated+as+a+slime+episode+37+release+datePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 11148 bytes
SHA-256: 11f70759bba0a265e3e6b7dc73dcf46e331d96956f5823462c5301129143fbc0
font_01_sfnt_off000110da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EC 18740 bytes
SHA-256: 5fc4bdea4866d54bf01bebefcd6e3df0d8c0a96e36f41b0dc3f6de1a780eeb95
font_03_sfnt_off000158b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158B1 18644 bytes
SHA-256: 6230df98a74a1eb92c05093457882230a58574cdaf709ae436f4f749f010ee0a

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