Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0fc6feb324a2dd…

MALICIOUS

PDF

88.2 KB Created: 2021-09-12 01:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8ae2d420c5c56034bb792f1ec09a430f SHA-1: 76009e148fd18c13f352b91e50ddd8cfea5cdf28 SHA-256: 4c0fc6feb324a2ddb1a25196ec4986255c039855749b7bbac269590c192d2ee1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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 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://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b4e28dc2a7f392911621bd7254e6a425/95726387767.pdf In PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091205091168.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/sidesanosoziwiwal.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/parobogodatibiguw.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/92139909263.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/wisunivanusemodedukep.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/fawabekiba.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161368c5744917---voxelopukajopagosinelor.pdfIn PDF document text
    • http://guchen.ru/d/files/bewefexizufugiti.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/56120091162.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/43543397810.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/13983855156.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/70298443287.pdfIn PDF document text
    • https://istanajp.com/contents/files/55613080411.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/zefumonilebusotujoz.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138171e45ecc---58898725453.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/32166107596.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/bunemewutusesex.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/duvofanejapotur.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b70ba02e34b4d793162721a2756e5e96/lorexav.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/kozapikinivazopakibelefi.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/kuwex.pdfIn PDF document text
    • http://uteambio.com/upload/files/dizopugijaw.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/famamibemabotul.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/69626594124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+check+how+much+data+you+have+left+on+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10594 11020 bytes
SHA-256: f5613b4005ee359711e5ef8a3caef4ece218a872b107bd07a631963526bb217c
font_02_sfnt_off00011f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F02 19968 bytes
SHA-256: 038560d3040b6bea9ffd4d096ec9e459be6db057b085bd149682806c05ba6869

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