Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ed284c7fbd714d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-10 22:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 68e6743306afcea9610c8660bb20a042 SHA-1: fe287a9ee22d7736627685a03e1135765c35daa6 SHA-256: 77ed284c7fbd714d09177d4b4332cb82aefbbdbe962cda8453fa4ead3d406307
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=galaxy+skin+code+generator PDF link annotation
    • https://yellowstonewildlife.com/vukunubojupelukemofewuli.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/pemuvepogojipoxonawavavir.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/puvebiv.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/lujow.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/sawebelesumefakob.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/52557121153.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109010719498227.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fad523755---vinefoxukopuruxow.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/61960091898.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/56072253118.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/darexuxojimodo.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b73e413969---22123573032.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/9231327862.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/42789752788.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/juvibotoluwof.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/xofoke.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/80116780335.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/ramuw.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a998f3805---nunaxuxetuwilazesurideda.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/xolowokikimerolobizo.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/49135073540.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/23829529819.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/bubedexoku.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/kuwujat.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_off0000d7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E2 17612 bytes
SHA-256: d4ae8a4c6fb7d7670709f7ebcf62981bf2daa35aaf325978bc86c5d7015e1bd5
font_01_sfnt_off00010553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10553 10892 bytes
SHA-256: 3656985131aadd6814394e7916ceb601ff7ec85659eda67ce1608ef9a86f617f
font_02_sfnt_off00011e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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