Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4df2423531e8c2…

MALICIOUS

PDF

95.1 KB Created: 2021-09-11 00:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 611cf12ccbd389d9ec151aea94eb76ab SHA-1: 030ac415b85c14ea40b1f44db33180c275cc4a79 SHA-256: cd4df2423531e8c2825616b359df0dba48531838494ecdc13ca91b299de5e103
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised websites, suggesting an attempt to redirect users to malicious content. Heuristics indicate malformed exploit streams and a high ML classification score, supporting a malicious verdict. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 http://irk-yoga.ru/upload/files/dudatufanalivasuzi.pdf In PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ca97e53ee---24068913710.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/mabitabijumamafora.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/16810284434.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/38174292101.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138092b62fc7---tojejawepugupodewudomeb.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/joponep.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/vixifitamigewavoti.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210908191547.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/42337169038.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/xerexow.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/wisirenun.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/fulapeniwovil.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/dagelamojalulozatugabeku.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/65064839539.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/lapifaxuvubanatupit.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3356452f2---17495949113.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/vatesovot.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/zowenoboraduvumuzujukemiw.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/47210090402.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/bodumixufotube.pdfIn PDF document text
    • http://vaithun.net/upload/files/nomopizadesotufasiw.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/6294126948.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/jorigibazelimob.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109080145041030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=hero+soccer+mod+apkPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB7 16708 bytes
SHA-256: 081f3acd8514d0bde40bed7e79bfda3a37287f1a077e8d17336b688a76984e82
font_01_sfnt_off0000f399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA6 2148 bytes
SHA-256: 5a95895b922fcedb8fdbba6229c1eb85418e002001d49b743aced21fae239038
font_03_sfnt_off0001155c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155C 10416 bytes
SHA-256: 85c96405f76a6276eadc0ae56be6c2d156edbcd4224362f9e22b5cfda918451c
font_04_sfnt_off00012cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFD 25244 bytes
SHA-256: 615a7cab861c094664042f644845f17fa875cd27edb05f764fc1f1090ec73123

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