Malicious PDF — malware analysis report

Static analysis result for SHA-256 be69717732cca78f…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 20:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b4249c151b3b4eb5a72df67c67ac076f SHA-1: 0b42faaa94b64ed3730b176025f1a5d98ff01d94 SHA-256: be69717732cca78f3dc615127759566140c3f98af84ec9fcc6b6a208015324e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many of which point to compromised websites or are structured as link farms. The embedded JavaScript (T1059.007) likely facilitates the malicious activity, potentially by redirecting users to malicious sites or initiating downloads. The overall pattern suggests a phishing or malware distribution attempt, likely delivered as an attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://huntic.ru/uplcv?utm_term=pubg+mobile+lite+apk+data PDF link annotation
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/1311486533.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/94200526996.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/roxapo.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/91026827627.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/kakarutisufarutini.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/vupub.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332484486b1---37304975899.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/xizenalozimalefok.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/sotob.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/gitef.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/nisew.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091914011873499.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/94624278970.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e236a21aa2---33630418442.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/91847657371.pdfIn PDF document text
    • http://tano-cable.com/d/files/bonenamotenogixifasakoxo.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/fewagedalitizujodilabure.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/43945935231.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614affb39d8ac---99144530737.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/24197578716.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/61298596654.pdfIn PDF document text
    • http://szpk.hu/_user/file/15238655344.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/vumatekawabexo.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/60604916432.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614897afdce37---9424541422.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_off0000b094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB094 15252 bytes
SHA-256: 9ae57f90de65092a1582e711acc5bce74eb828cd440d980c886622be8e685b1f
font_01_sfnt_off0000d738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD738 10696 bytes
SHA-256: cdda6e382f7038761a122b11c2fa72fa97e9574f53090b75c610f39c49fe05d5
font_02_sfnt_off0000ef55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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