Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a305a9f7a55e5b5…

MALICIOUS

PDF

86.2 KB Created: 2021-09-15 03:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ab572e4a83b7dd8b37555bed79b8870f SHA-1: fbe19ca435c19efce946c0f021f6e6aad598d859 SHA-256: 4a305a9f7a55e5b5e52074b98151b7d6f3828f5b60bb87265b2e64deeaec5b48
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 WordPress sites or disposable hosting, forming a link farm. This suggests the document's primary purpose is to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.naraihillgolf.com/admin/userfiles/file/rezekopefogine.pdf In PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/08h4bp5esggku00pmpd3kl1sm2/luzewidolitofufidevud.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/67738513897.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/zideminilukipofekuseri.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/f0a8f3853ad94a33d2ccd7ede1b72874/27582745609.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/35411548298.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/webejomim.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/dowapuzukinorufozidilis.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/wagamuxibiwezipadudabid.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210909192057_2104084981.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613619ddf170e---legepasujexepabuzusawurob.pdfIn PDF document text
    • http://szmchem.com/userfiles/file/49452955415.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/pagakejit.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613eebd7846a0---23089207534.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/kuruxasiwujuwujawe.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/tigalafabobexuxo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/85137233060.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/46fe04a07f123c949f6073cb210f0d94/41259042634.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/14184379193.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/pusaviwanaje.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/nojijigaz.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/08195158300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=posturi+tv+online+pe+mobilPDF 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_off0000ecd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD6 17944 bytes
SHA-256: 93bf135d444ad8ddc953334f7790c6cb96a752a97a12d3c7a7813611a7fddc63
font_01_sfnt_off00011b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001334f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334F 10560 bytes
SHA-256: 283cba75ab5249d4a30cfa6f0c3150f146747c6c2b61534935acaa5f42cc03f2

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