Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbe0f80354334ae…

MALICIOUS

PDF

87.6 KB Created: 2021-09-17 20:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e07099afa76b864b77574308592adb56 SHA-1: f9b44a1e853639545963ffa08c00d5ea8313bffe SHA-256: 8cbe0f80354334aebda173d783bdaaf67f6b3d6a74e09e90646e7b8a43668605
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=redmi+note+9+size+in+cm PDF link annotation
    • http://vom-ragnaroek.de/uploads/file/4345600533.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/6142b4743ee52.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/muwezulaxulavitowirokuvud.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/jugubumisasatavir.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/xiwabaxogajumimox.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/pizadixalavotobureg.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/vobamabisujotatid.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/89323227680.pdfIn PDF document text
    • https://123natura.com/stockages/files/56668569459.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/wirugopemixugususavot.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/47946811109.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210902225848_cywhmk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130724ad73b1---97152722774.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/pewasanimesitusa.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/c22d370317acbbdb749d9a4556ef104c/firulavegejerudobepalovo.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/mosepikeb.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/lanusemelitefepawo.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/unev4s3nsqh2ldc7ijt174vtl0/lafakikozetavudunux.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/41738346348.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/budelodemanixagezitidu.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/selazene.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/97808599935.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/libodubikifomefuvirejote.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/mutowetumajetijabog.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/wodesabalesulexiteje.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_off0000eb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB23 10496 bytes
SHA-256: 1c06496c128f98c1673d1bc8cae67474f3297e6d23119bcde2ec9470924c43f8
font_01_sfnt_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 20452 bytes
SHA-256: a1e00e06683be995b3f2510f0c784acb51bddef4114c43a9b7567fbf55ad3988
font_02_sfnt_off00013878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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