Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5ac9620c44d956…

MALICIOUS

PDF

92.2 KB Created: 2021-09-04 12:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 14980659657be852fa90d66310c6364c SHA-1: 8cf44a5ad370bbde1705be480659cf17b590702a SHA-256: ec5ac9620c44d956c16023f2e57a60530dac4dfe78549618590a930884e3a8de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. These links form a link farm designed to redirect users to potentially malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://abnicum.com/files/file/3173675015.pdf In PDF document text
    • http://statsale.com/data/upload/ck/files/wojagu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/18236875641.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0e217080f---61406005811.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fbf90b8137f---jivesakugovirezofi.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/45c5ff0de1b61787b8b0b30fa20a8a0b/jokafubapimosojokipaleziv.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/90798383810.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebc6fd94ca---wobazigidileni.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa79999e2a1---66695568815.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d7fa004e6---famefojukisi.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/67902150574.pdfIn PDF document text
    • https://landi-bg.com/images/file/91155768991.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/5ukajrd4bbgvmlcmbu63dv77j0/damuruxoraferadorenitum.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/wosixajap.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/mavakumuwedisaluv.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/zusigote.pdfIn PDF document text
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/66535450576.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210705155816958.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/8ib4ruvdcaov6ropjodbsi7pl2/dusonunat.pdfIn PDF document text
    • http://e-hematologica.com/users//file/vagofuroti.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/35800495025.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/13775672409.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/bulojeviwarozawejeseva.pdfIn PDF document text
    • http://hncastlecable.com/d/files/temirumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=computational+and+inferential+thinking+the+foundations+of+data+science+pdfPDF link annotation
    • https://www.unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/67359010150.pdfIn PDF document text
    • 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_off0001028c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028C 17540 bytes
SHA-256: 7aa9aa922c0ad2dfa238a72f355dfdb7b207a9f540b5a606175f657acb94b045
font_01_sfnt_off00012fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BE 11288 bytes
SHA-256: 2b4504a112cfc52941dee521a9c0701110582f9032639a3706370d9ee80ba176

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