Malicious PDF — malware analysis report

Static analysis result for SHA-256 de52e3ffeabe6b40…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 09:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 19c67e077e84e2be43f368ec25c594e2 SHA-1: 88dfd4b04a39e469f49063f5852d05a177325886 SHA-256: de52e3ffeabe6b409e298754aac6c45dd8b2cd4f8791e36d04e518703516465b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, a common technique for phishing or distributing malware. Heuristics indicate these links point to compromised CMS uploads and disposable hosting, suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely serving as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://inwebjor.ru/uplcv?utm_term=change+default+sim+android PDF link annotation
    • http://martonaroniskola.net/userfiles/file/maguzumogaze.pdfIn PDF document text
    • http://yjccnc.com/upload/files/jeluxotimasanagevalit.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/86109449047.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/boxamuza.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/0791a2beca23379db51961fbcec1c8b9/vuneviwezad.pdfIn PDF document text
    • http://wirheiraten.de/images/file/5533775840.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/92737184053.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/nofisojorafewigifewuz.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/23637105668.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/34480513683.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81505618514.pdfIn PDF document text
    • https://mihalex.by/files/files/vagagukijizuwexaw.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/lerirokew.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210903_035827.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090712504021.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/risajali.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/jujerevoradojijuzefa.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/vugifisabofinixa.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/piwudexesalax.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/lobowomosoborugotexat.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/97448795333.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/reposukapari.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161347f91cbf1e---2062392969.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/74927231257.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/notoxabeniderokijikewas.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161338a12ca7b1---18780227512.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_off0000d5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBD 17412 bytes
SHA-256: 919a55288b94b4417c3614299b0e0af8da114b13a929c44c12796d0c2b1ecd8d
font_02_sfnt_off00011aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFF 10932 bytes
SHA-256: 161f3637419756d89b49f0b8663ecb6cc4dd377a24c368658fd67ccdf5f76d10

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